Refugees, asylum-seekers and undocumented migrants and the experience of parenthood: a synthesis of the qualitative literature

Objective To synthesize the recent qualitative literature and identify the integrative themes describing the parenthood experiences of refugees, asylum-seekers and undocumented migrants. Methods We searched seven online databases for the period January 2006 to February 2017. We included English and French published peer-reviewed articles and graduate-level dissertations, which qualitatively examined the parenthood experiences of refugees, asylum-seekers and undocumented migrants. We summarized study characteristics and performed a thematic analysis across the studies. Results One hundred thirty eight studies met inclusion criteria. All but three were conducted in high-income countries, mainly in the US. Migrants studied were mostly undocumented from Latin America and refugees from Sub-Saharan Africa. Almost all studies (93%) included mothers; about half (47%) included fathers; very few (5%) included extended family members. We identified three integrative themes: 1) experiencing hardship and/or loss in the context of precarious migration and past traumas; 2) building resilience and strength by bridging language, norms and expectations; and 3) living transnationally: obligations, challenges and resources. Each theme contributed to shaping the parenthood experience; the transnationalism theme intersected with the themes on hardship and loss and resilience and strength. Conclusion More research is needed with fathers, extended family members, asylum-seekers and in the LMIC context. A transnational lens needs to be applied to programs, policies and future research for refugee, asylum-seeker and undocumented migrant parents. Addressing transnational concerns (family separation and reunification), acknowledging transnational resources, fostering a transnational family identity and conducting transnational and longitudinal studies are potentially pivotal approaches for this sub-population of parents. Electronic supplementary material The online version of this article (10.1186/s12992-017-0299-4) contains supplementary material, which is available to authorized users.


Background
In many countries migrant families with children are a rapidly growing population, with migration for some, sparked by threats of war and violence, political and civil instability, and poverty [1][2][3]. Parenthood, whether for first or subsequent children, involves emotional, social and physical changes as well as adaptations of functional roles [4], which continue through childhood from infancy to teen years/young adulthood. While all families may face challenges, migrants may experience compounding difficulties due to the loss of social support networks including their extended family, adjustments necessitated by a new cultural context, experiences of discrimination, declines in social economic status, and reduced access to health and social services [5][6][7][8]. Refugees, asylum-seekers and migrants with undocumented status have particularly challenging migration trajectories. They may have suffered abuse and trauma pre-and during-migration and are more likely compared to other migrants, to be exposed to unfavorable and stressful conditions in the receiving-country, which puts these families at risk of marginalization [5,[8][9][10][11][12].
There is recognition that migrant families with children often face multiple difficulties and need specialized support [13][14][15][16], however less attention has been given to the unique parenthood contexts presented by having a humanitarian or precarious migration status [17,18]. Greater understanding of the experiences of refugee, asylum-seeking and undocumented migrant families, especially from their perspective, could inform health and social services, practices and policies. Literature reviews are useful in this regard, especially when the literature is voluminous and complex. There is a large amount of primary research, predominantly qualitative studies, on the parenthood experiences of refugees, asylum-seekers and undocumented migrants and parenthood experiences [19][20][21][22][23][24][25], however no reviews of this body of literature were identified. The purpose of this review was therefore to synthesize the recent qualitative literature and to identify integrative themes describing the parenthood experiences of refugees, asylum-seekers and undocumented migrants.

Methods
We used an integrative approach to our synthesis, which involved amalgamating and summarizing data from the qualitative literature [26]. Thematic analysis was used to identify integrative themes that reflected and described the parenthood experiences of refugees, asylum-seekers and undocumented migrants across the research [27][28][29].

Search strategy
We searched seven online databases: EMBASE, Medline, Global Health, CINAHL, PsycINFO, sociological abstracts, and social work abstracts. The searches in CINAHL and EMBASE excluded Medline records. The search strategy was developed in consultation with a university librarian. Subject headings and keywords used related to parenthood (e.g., motherhood, fatherhood, parenting, child rearing) and migration (e.g., immigrant, refugee, immigration, asylum) and terms were adjusted depending on the standardized vocabulary used for each database. The searches for migration and parenthood were combined using the AND Boolean operator. Keywords were searched only within the titles, abstracts and keywords. Searches were limited to English and French literature and to the period of January 2006 to February 2017. An example of a detailed search strategy (i.e., MEDLINE) can be found in Table 1.

Inclusion and exclusion criteria
The inclusion and exclusion criteria are summarized in Table 2. Studies must have included refugees, asylum-seekers and/or undocumented migrants and examined the impact of migration on parenthood experiences. The following definitions were used to determine whether or not eligible migrants were included in studies. Refugees refers to migrants who fled their country to escape persecution for reasons of race, religion, nationality, membership of a particular social group or political opinion [30]; asylum-seekers are those who left their country and are seeking refugee status in another country and awaiting a response to this claim [30]; and undocumented migrants are individuals who migrated through irregular channels (i.e., movement outside of regulatory norms without the necessary authorization or documents required under immigration regulations) or who remained in a country without authorization or documents required under immigration regulations [30]. 'Parenthood experience' was defined as 'the state of being a parent and the responsibilities involved' [31]. It included the experience of becoming a parent and/ or the experience of parenting (i.e., the process of supporting the physical, social, psychological and intellectual development) a child/children including teenagers and youth.
The literature was restricted to empirical studies with qualitative or mixed methods research designs. The latter must have included a qualitative component. Methodological quality was not an exclusion criteria since the intention was to review and report on the literature broadly. Studies must have reported the perspectives of 10. 5 or 6 or 7 or 8 or 9 11. 4 and 10 12. limit 11 to (english or french) 13. limit 12 to humans 14. limit 13 to yr. = "2006 -Current" 15. limit 14 to (case reports or classical article or clinical trial, all or comment or comparative study or controlled clinical trial or editorial or evaluation studies or government publications or introductory journal article or journal article or letter or meta analysis or multicenter study or observational study or published erratum or randomized controlled trial or "review" or "scientific integrity review" or systematic reviews or validation studies) The asterisk (*) is a wildcard symbol and represents any group of characters, including no character. The wildcard expands the search to include variations (spelling, various endings) of the search term those experiencing parenthood including mothers, fathers and/or others (extended family members or guardians) involved in parenting a child in the settlement country (i.e., children had to be in the new country). Studies examining the parenthood experience in the context of illness or disability (parent or child), were excluded. The geographic location of the study could have been anywhere, including a high-, low-or middleincome country. We considered peer-reviewed articles as well as dissertations; if results from a dissertation were also duplicated in a published report, only the latter was retained. Published articles that had duplicate data were kept when additional and relevant data were reported in one paper but not the other(s) and/or the focus and analysis of the data were different.
We downloaded and managed all citations using Endnote X7 software. LM screened all titles and abstracts for eligibility. When eligibility could not be ascertained, the methods and results' sections of the papers were reviewed. SP independently reviewed 10% of the titles/ abstracts to determine consistency in the selection process. The rate of agreement between the two reviewers for eligibility was 92%. Discrepancies were resolved by fully perusing the papers and coming to a joint decision through discussion.

Data extraction, collation and reporting
For all papers that met the inclusion criteria, we extracted and stored data in an excel database. Data extracted included: 1) paper characteristics [i.e., publication year, language, and discipline (based on the academic credentials and/or department of the first author or the journal if the first author's information was not stated)]; and 2) study information, including the objective, research design, the data collection methods, country location and migrant population studied. The research design was based on what was stated in the article (i.e., mixed-methods, ethnography, qualitative descriptive, grounded theory, narrative inquiry, case study, phenomenology). In cases where it was not explicitly named or it was unclear, we categorized the study design based on the description provided. General 'qualitative' exploratory studies were categorized as 'qualitative descriptive' [32]. For mixed-methods research designs, the design for the qualitative component(s) was also documented. Data collection methods were categorized into: interviews (including semi-structured, informal, structured interviews), observation (participant or non-participant observation), focus groups and other (e.g., photovoice, journals, field-notes, questionnaires, text review). We also noted whether migrants' receiving-country language ability was a criterion for study participation.
We categorized the country where the study was conducted as either a high-income country or a low-or middle-income country (LMIC) (based on the World-Bank Classification). For 'migrant population' we recorded the exact description as reported in the paper (e.g., Latinas) as well the migrants' origins (categorized according to world regions), the migrant group (refugee, asylum-seeker, undocumented) and whether or not data on migrants' length of time in receiving-country was collected and considered. We recorded whose (mother, father and/or other person such as a grandparent) parenthood experience was examined and the age-group of Refugees are those who fled their country for reasons of persecution; Asylumseekers are those who are seeking refugee status in another country and awaiting a response; and Undocumented migrants are those who migrated through irregular channels (i.e., movement outside of regulatory norms including entry and stay without the necessary authorization or documents required under immigration regulations). Studies may also have included other migrants in their samples b Becoming a parent included women's experiences of pregnancy and giving birth only if it included the experience of becoming a mother. Parenthood experiences included the experiences of mothers, fathers and also other individuals parenting children (e.g., grandparents) c Studies that described the experience of parenthood in the context of reunification (parents and children in the new country) or discussed issues of transnational parenting as it related to the parenthood experience in the new country, were included the children (e.g., school-age, teenagers). All paper and study characteristics were descriptively analyzed.
All of the original descriptors and descriptions of categories, themes, and sub-themes from the results' sections of the studies that were relevant to the research question were also extracted and compiled into the excel database. The extracted data were entered into columns organized by whose perspective was reported-mothers, fathers, and mixed parents (mothers, fathers and extended family members). Details specific by migration status (refugee, asylum-seeker, undocumented) were noted within each column. For studies where results were reported for migrant (refugees, asylum-seekers, undocumented migrants and other migrants) and/or parent (mothers and fathers) groups together, extraction involved identifying and recording specific experiences within the primary studies' results that were associated with the sub-groups.
The thematic analysis was led by LM. All extracted themes, sub-themes and categories and accompanying descriptions were reviewed and coded. A coding framework was developed iteratively by incorporating the content and essence of the original study themes into codes that represented the parenthood experiences from across the studies [26,28]. Codes were compared by 'parent group' (mother vs. father) and migrant group (refugee vs. undocumented; there were too few studies to compare asylum-seekers) to see if there were particularities within, or identifiable patterns in experiences across these sub-groups [26,33]. To address the limitation of combined results (migrant and/or parent groups), comparisons were also made between studies with combined results and those which reported on specific sub-groups (i.e., refugees, undocumented, mothers or fathers). The integrative themes were generated by organizing the codes into broader groupings and observing how they related to each other [29]. SP and NE reviewed the codes and the integrative themes and suggested refinements. Several discussions among all authors during the analysis phase were used to arrive at the final wording of the integrative themes. See Table 3 for an example of an integrative theme derived from the extracted original themes and sub-themes. Figure 1 shows results from the database searches. The searches yielded 6338 citations and 4744 titles and abstracts after duplicates were removed. One-hundred and thirty-eight papers met the inclusion criteria for this integrative synthesis. Table 4 summarizes the characteristics of included studies. Most of the research was published between 2011 and 2017. All papers were in English and the vast majority of studies were conducted from a social-sciences' perspective. Almost all studies had been conducted in high-income countries, predominantly the United States (54%; n = 75), followed by European countries (15%; n = 20), Australia (14%; n = 19) and then Canada (12%; n = 17). Only three studies (2%) had been conducted in LMICs (Morocco [34], South Africa [35] and the Dominican Republic [36]).

Results
Migrant groups studied were mostly from Latin America, Sub Saharan Africa and South East Asia. Latin American migrants were primarily undocumented migrants living in the US (37% of studies, n = 51), while Sub-Saharan African and South East Asian (Vietnamese and/or Cambodian) migrants were mainly refugees (35% of studies, n = 48; 10% of studies, n = 14 respectively) living in a range of countries including Australia, the US, European countries and Canada. Only 7% (n = 10) of studies included asylumseekers. One study focused on undocumented migrants who were sex-trafficked women who migrated to Israel from the former Soviet-Union [37]. The majority of studies (93%; n = 129) included mothers; in 54% (n = 70) of these participants were exclusively mothers. Approximately half of the studies included fathers (47%; n = 65); a small portion of these, 14% (n = 9), focused specifically on fathers. Only 5% (n = 7) of all studies included extended family members. Study populations were most often parents of school-aged children (29%; n = 40) and teenagers/youth (30%; n = 42).
Additional file 1 provides more detailed information about each individual study. Populations were mostly described only by country or region of origin. Just over one-fifth of studies (22%; n = 31) also described their population by ethnicity/religious identity (e.g., Latino, Hmong, Muslim); and fewer, 2% (n = 3) also used race (i.e., Black). The majority of studies (67%; n = 92) included other migrant groups (e.g., economic and family sponsored immigrants) in addition to refugee, asylumseeking and undocumented migrants. Participants were 'recent arrivals' in 28% (n = 38) of studies, usually defined as less than five or 10 years; four studies (3%) purposely focused on more established migrants. Twentytwo percent (n = 30) did not provide any information about length of time since migration. In most studies with both mother and father participants (59%; n = 33 of 56 studies), the number of males was much smaller than the number of females.
Refugees, asylum-seekers and undocumented migrants and parenthood experiences: Integrative themes We identified three integrative themes across the studies: 1) experiencing hardship and loss in the context of precarious migration and past traumas; 2) building resilience and strength by bridging language, norms and expectations; and 3) living transnationally: obligations, challenges and resources. Each theme contributed to shaping the parenthood experience; the transnationalism theme intersected with the themes on hardship and loss and resilience and strength. Themes are diagrammatically depicted in Fig. 2 and detailed descriptions (codes) are reported in Table 5.

Experiencing hardship and loss in the context of precarious migration and past traumas
Common and core to the migrant parenthood experience were sacrifice, hardship and loss. In studies with undocumented or mixed-status families and asylumseekers, the uncertainty of their future in the receivingcountry impacted many facets of their lives and was key to their hardships [21, 25, 49, 52, 54, 56, 60, 72, 74, 76, 81, 85, 87-95, 100, 103, 134, 141, 143, 148, 152, 157, 164, 165]. Those without status lived in fear of deportation and separation from children and family [21, 60, 72, 87-89, 91-94, 99, 141, 147, 152, 157]; parents were in the difficult position of having to discuss their precarious status with their children and to prepare for the outcome if they were ever deported [85,90,164]. Not having status restricted their movement and interactions [21,49,50,54,72,87,88,90,92,93,95,99,105,133,134,141,147,165] and adversely impacted their safety (since migrants would not seek help, including for family violence) and had profound effects on their mental wellbeing [72,94,99,100,102]. Undocumented families were frequently ineligible for services and/or would not seek services fearing that this action might affect their future status [21,56,72,87,88,92,105,151,152,157,165]. Asylum-seeking parents also feared separation from their children if their applications for refugee status were not accepted. They worried about being returned to an unsafe country with their children [24,25,81,82]. Access to services and rights, such as being allowed to work, varied depending on the receiving-country [24,25,68,81]. Like undocumented families the precariousness and difficult circumstances caused strain and affected the well-being of the whole family [24,25,68,81,82].
In studies with refugee families, the main contributors to their sense of loss and to the adversity that they faced, were the forced nature of their migration and experiences of war, violence and the death of family members and friends [22, 24, 53, 55, 62, 66, 81, 82, 98, 106, 139, 146, 154-156, 159-161, 163]. Some refugee mothers, including unaccompanied minors, experienced parenthood as the result of rape [81,82]. Refugee parents were affected by past memories and worried about family and friends who still remained in their country of origin or were missing; these intensified concerns they had for the safety of their children.
Overall families in many studies felt that life in the new country was not exactly how they imagined it would be. Resettlement difficulties, particularly for undocumented migrants, hindered families from advancing as they would have liked and parents reported disappointment and needing to adjust their expectations due to these challenges [22, 24, 77, 89, 90, 116, 127-129, 148, 149, 165]. In some studies parents expressed a need for more information regarding their rights, eligibility and availability of support and services [23,54,61,105,133,150,158]. In several studies they requested more information about how systems (education, welfare, social services, health, and child protection) worked and their related legal frameworks and cultural expectations about parenting [23,25,54,55,57,61,63,100,114,115,119,121,126,132,133,146,150,151,[155][156][157].
Family separation, including parents' separation from their children, was common across all classes of migrants and was a major source of concern in a number of studies [22-24, 53, 55, 58, 68, 75, 81, 84, 87, 135, 139, 145, 146, 161]. Migrant parents were supporting these family members by sending remittances and also parenting children who remained in their countries of origin [21,24,49,50,56,58,68,84,87,112,127,129,135,145,161]. In some studies parents reported feeling guilty and torn between their family/children living in the receiving-country and those back home [58,87,135,161,165]. Some refugee and asylum-seeking parents felt particularly worried about the safety of their children and family who remained in their home country; in some cases they did not even know where their family members were or if they were alive [22,23,116]. Undocumented parents in some studies struggled with not being able to travel back to visit their home country for fear they would be caught by authorities and be unable to return to the receiving-country [84,88,90,140,148,165].
Transnational ties were also maintained through serial migration and deportation of family members. In some studies families and parents spent years separated before spouses, children and/or other family members would join them [24,56,68,135,143]. In other instances, families lived with the hope of eventual migration of family members but were uncertain if it would ever be realized because of their precarious migration status or because of the administrative and financial challenges encountered in sponsoring family members [23,24,56,68,135]. For undocumented migrants, deportation was a constant threat and in the few studies where it had occurred and it was discussed, fathers were the ones who were targeted and returned to their home country [90,93,141]. The impact of serial migration and deportation led to families being fragmented and dealing with issues such as single parenthood and reunification [21,39,55,68,93,97,135,141]. This included altered support systems, changing family dynamics and relationships, and/or added responsibility and stress, and community stigma (i.e., being a single mother) [39,58,68,87,135,141]. Where reunification with family, particularly children, had taken place, parents described the challenges of learning to live with each other again and coping with emotions of having been separated (e.g., parents felt guilty, children felt resentment) for lengthy periods of time [39,55,58,87,97,121,135].
Transnational ties were also used as a positive resource. Parents in many studies drew on support from family and friends as a source of social support and parenting advice for their children [22,44,84,108,114,127,130]. Maintaining family connections in the home country, including visiting and sending children to visit, was described in many studies as a means to maintain their culture and traditions and to teach children their language [20,44,74,84,122,125,130,135,140,145]. A few studies reported that parents also continued to maintain active involvement (e.g., work, return to use health services) in their countries of origin which enhanced resources available to the migrant family [46,127,130,140]. Families in some studies envisioned returning to their country in the future, and some were also preparing for the eventuality that their children would go live and work in their home countries as adults [38,62,84,127,139]. Similarly, although less positive, some undocumented families were also preparing for the possibility of deportation [21,85,141,157]. Lastly, maintenance of connections was described in some studies as serving as a source of resilience by preserving their identity and positive sense of self, which were essential in coping with loss and resisting oppression [46,73,74,84,116,122,140].

Discussion
There is an extensive amount of qualitative research on the parenthood experiences of refugees, asylum-seekers and undocumented migrants; this is the first review, however, to synthesize and identify integrative themes from this body of literature. The themes regarding hardship and loss, and building resilience and strength, are consistent with observations made by others regarding the migration experiences of refugees, asylum-seekers and undocumented migrants generally [11,166,167], while the third theme on transnationalism highlights additional obligations, challenges and resources that need to be better understood and considered by care and service-providers working with these families. This theme also suggests a lens through which policies and research may be approached.
In the context of parenthood, our review shows that migration and resettlement stresses compound the responsibilities and concerns related to raising and caring for children in a new country and may have deleterious effects on the family [17,54,73,98,168]. Many experiences identified are common across all types of migrants [15], however results highlighted distinctive challenges related to having a precarious and/or humanitarian status. Furthermore refugees, asylum-seekers and undocumented migrants mostly migrate from LMICs and the cultural, social and religious differences between these countries and high-income countries are great and exacerbate resettlement difficulties, further adding to families' stress. Despite these additional hardships and losses, the literature also showed that these sub-groups are resilient. Similar to other research on migrants and resilience, family and community support, maintenance of language, religion and culture as well learning new languages and ways of doing, fueled resilience [169]. For refugee, asylum-seeker and undocumented migrant parents, children were also an important source of strength and motivated parents to overcome their difficult circumstances. Together these results reinforce that greater attention is needed to address the unique challenges that refugee, asylum-seeking and undocumented families encounter and that efforts towards supporting families should concentrate on approaches that enhance resilience and strength, especially by bridging language, norms and expectations.
Transnationalism as it relates to migration and families has been a long time focus in the fields of sociology and anthropology [170,171] while in the health disciplines it has largely been absent. A "transnational perspective" acknowledges that migrants' experiences extend across countries and that families are affected by their relationships that they maintain with family and friends, their continued economic and political involvement, and their ethnic and cultural attachment to the home country [172]. Work in this area has mainly focused on transnational mothering (parenting children who remain in the home country from a distance) [173,174], impacts of migration on children and elderly who remain in the home country [175,176] and economic effects for families and societies via remittances [177]. Little to no research however has directly considered how transnational ties impact parenthood with children in the new country. Our findings build on the research on parenthood and transnationalism [178] and suggest a transnationalism lens is relevant in the healthcare field. Similar to studies on transnational parenting, our results highlight the strong sense of obligation, stress and distress parents experience in parenting from a distance their children who remain in the home country [178]. In addition, our results show how transnational obligations, as well as stresses associated with serial migration and deportation of family members, affect family dynamics and relationships and how parents experience parenthood in the new country. Findings also show how transnational ties may be positive and provide resources and support for migrant families with children. Parents' health and well-being are therefore inextricably linked to their transnational realities and a receiving-country-centric approach is limited and inadequate for understanding their experiences and addressing their needs. In order to develop more relevant policies and practices, including in healthcare, a transnational lens is needed [171,179,180].
Traditional parenting and family support programs tend to emphasize integration and center on resettlement concerns [181,182]. Using a transnational lens in program and policy development and design would include fostering a transnational identity and sense of belonging. This may be achieved by supporting families to practice their traditions and faiths, and speak and learn (for children) their languages. It would also include encouraging families to maintain their networks and ties to their home country [116,133]. This would include acknowledging and addressing transnational parenting concerns (supporting family members back home, parenting from a distance, family reunification, deportation of family members) [183], and also recognizing and valuing transnational ties as a resource for families that can be used to foster resilience by building cultural, social and economic capital for parents and children. A transnational approach also involves building trust and resolving cultural frictions by "bridging languages, cultures and norms" between migrant and non-migrant communities. This would consist of creating opportunities for migrants to share their culture and traditions with the receiving-country population [73,133,142] as well as ongoing efforts to allow migrants to learn new languages and become more familiar with the way of life in the new country [132]. For the receiving-community it would involve raising their awareness of migrant issues, enhancing their empathy and sense of responsibility for migrants and their families living abroad, and addressing negative discourses [184].

Limitations and strengths
This review has a number of limitations. Firstly, two thirds of the studies included other migrant groups in their sample, and none of these studies reported results separately making it sometimes difficult to ascertain to what extent results reflected the experiences of refugees, asylum-seekers and undocumented migrants. Asylumseekers were also under-represented in the primary studies, providing less insight about the experiences of these families. Similarly, very few studies included extended family members, and although close to half of the studies included fathers, there were proportionately fewer fathers than mothers in the study populations. Furthermore, in studies with both mothers and fathers results were always combined and reported together and there were no comparisons made by parent sub-group.
Secondly, we did not include other migrants groups, such as temporary agricultural or domestic workers, or mail-order brides or other migrants who may also have migrated under difficult circumstances and face similar challenges as refugees, asylum-seekers and undocumented migrants. They may have had some different perspectives due to the nature of their migration trajectory and status in the new country. Thirdly, given there were very few studies conducted in LMICs conclusions cannot be drawn regarding the parenthood experiences of refugees, asylum-seekers and undocumented migrants specifically in a LMIC context. The challenges, concerns, hopes and expectations for these parents are likely to be very different, especially for those living in refugee camps or for those transiting through during their migration to another country. Lastly, it is possible that we did not include some relevant literature, particularly studies conducted in LMICs, due to the language restrictions and because we did not include grey literature.
This review, however, does have many strengths. Our approach was inclusive; the literature covered a broad range of parenthood experiences and diverse populations living in a number of countries. The analysis was integrative and reflected a large body of research. Included studies had a number of methodological strong points. Language was infrequently an exclusion criteria (10%) and in most studies researchers accommodated diverse languages with bilingual research assistants or interpreters; populations were defined mostly using recommended indicators (country of birth, length of time in receiving-country, migration status) [185]; aims and objectives were clearly stated in all; and many studies presented a reflexive approach [186].

Practice and policy implications
The literature touched on a range of parenthood topics and suggest implications for policies and practices across multiple sectors, including the social, health, educational, as well as the political spheres. These include development of policies that address the undocumented and mixed status situation of families [54,70]; removing eligibility barriers for health and social services, particularly for undocumented migrants [25,54,70]; enhancing mental health services and support for migrants who have suffered trauma, including young mothers who have experienced pregnancy as the result of rape; improving communication regarding laws, rights and access to services to migrants [54,150]; and better mechanisms in the community and schools to support parents with parenting including discipline and supporting their children in school [55,150]. A transnational perspective implies sensitivity training of educators, healthcare-providers, social workers, and child-protection workers is needed regarding the effects of the migration trajectory, migration status in the new country and ongoing transnational ties, on migrants' health and well-being [23,55,119,162]. In practice it involves validating families' transnational experiences and enabling families to cope more effectively by tapping into their strengths and resources, including their transnational resources to help families overcome and recover from their adversity [183,187]. At the policy level, policies which promote cultural cohesion between communities and address family separation, are also required.

Future research
We need to know more about asylum-seeker families, particularly how they navigate parenthood in uncertainty while they await a response to their asylum claim and also when they receive a negative response to their claim. Further inquiry on the experiences of fathers and extended family members is warranted as well [188]. The role of extended family is an important gap to address since in many cultures parenting is shared beyond the mother and father and research has shown they have an influence on families in the migration context [189,190]. Extended family members may also have different experiences [138,142]. Moreover, they can be a significant resource for families [44,138]. Lastly, given that LMICs are host to the vast majority of refugees, and also receive significant numbers of asylumseekers and undocumented migrants [191], research in these countries is needed as well.
Research on the parenthood experiences of refugees, asylum-seekers and undocumented migrants must also consider the transnational realities of these populations. This research should include the perspectives of family members in the countries of origin [188]. Longitudinal work that follows families over their migration trajectory (across countries), may also offer further insights on the effects of migration on parenthood experiences over time [188,192]. Research should aim to further understand the impact of transnational ties on parenthood, including transnational obligations (parenting other children and family who remain in the home country) and the effects of serial migration and deportation of family members. Better knowledge of transnational resources, and how to optimize these could also inform interventions and services towards supporting migrant families with children. Examining whether current health and social interventions consider the transnational challenges of migrant families' lives would be relevant as well. Healthcare providers and others working with migrant families (social services, schools), may then be better equipped to promote protective factors, mobilize untapped resources and support migrant families in dealing with their day-today life challenges.

Conclusion
We synthesized a large body of literature and our integrative analysis highlighted differences in parenthood experiences by migration status (refugee vs. undocumented) and also by parent group (mothers vs. fathers). Results from the review suggest that to further understand the experiences of refugee, asylum-seeker and undocumented migrant families, and to better address their needs and enhance resiliency, a transnational lens is needed.

Additional file
Additional file 1: Refugees, asylum-seekers and undocumented migrants and parenthood experiences: Summary of Literature (DOCX 65 kb)