Influences of the family of origin on the timing and quantum of fertility in the Netherlands

Intergenerational transmission of fertility in Great Britain: A parity-specific investigation using the 1970 British Cohort Study

Studies in low-fertility settings have consistently found positive relationships between parents' and children's fertility timing and family sizes, and these persist after accounting for socio-demographic factors. We explore intergenerational transmission of fertility in Great Britain, where socio-economic inequalities are larger and could play a greater role in explaining intergenerational continuities than in other settings. Using the 1970 British Cohort Study, a long-running longitudinal data set, we estimate parity-specific discrete-time event-history models to investigate the role of mother's family size and age at first birth in birth transitions. We find stronger evidence for transmission of birth timing and family size in transitions to first and third births than second births. Family size transmission affects daughters more than sons. Accounting for socio-economic and demographic characteristics does not explain these associations. Except for first births, transmission of fertility is equally likely across the socio-economic hierarchy, highlighting the importance of socialization and cultural preferences for fertility transmission, even in the relatively unequal British context.

Return Migration and Fertility: French Overseas Emigrants, Returnees, and Nonmigrants at Origin and Destination

Although growing research has emphasized the critical importance of studying returns for understanding various aspects of migration processes, knowledge regarding return migrants' fertility behaviors remains limited. This study addresses this knowledge gap by comparing rates of first births and completed fertility among three groups: nonmigrants (at origin), migrants, and return migrants. Using extensive data collected both in the home regions and at destination, we analyze female migration from Martinique, Guadeloupe, French Guiana, and Réunion Island to metropolitan France (European France). We find intermediate fertility behaviors for return migrants relative to nonmigrants and migrants: on average, completed fertility levels are lower among return migrants than nonmigrants but slightly higher among return migrants than migrants. Some of these differences can be attributed to selection into migration and return, although significant gaps persist among women with similar socioeconomic characteristics. Our findings highlight three key observations. First, when migrants return before beginning childbearing, their transition to motherhood closely resembles that of nonmigrants with similar characteristics. Second, the lower fertility rates among prospective return migrants indicate an anticipation of disruption effects. Finally, reduced fertility while residing in metropolitan France translates into lower completed fertility rates for return migrants.

Associations between early family environment and ideal number of children

Childhood family is vital for the formation of fertility preferences and attitudes towards family life. Yet previous studies mainly focused on structural aspects of the family, whereas the role of perceptions of one's family in relation to fertility preferences remained largely understudied. This study examined how different aspects of the early family environment (i.e. relationships with parents, happiness in childhood, parental conflicts, family resources, as well as family structure) are related to the ideal number of children reported in adulthood. Using representative cross-sectional survey data from the Finnish Family Barometer 2015, the sample comprised men and women aged 20-45 with and without children. Poisson regression models indicated that a higher number of siblings was associated with a higher ideal number of children, whereas living in a single-parent household and overall negative perceptions of parents were related to a lower ideal number of children independent of various socio-demographic characteristics. Further analyses showed that these family characteristics were associated with the ideal number of children mainly among childless people but not among parents. The findings suggest that the early family environment is related to the formation of the ideal number of children, especially for childless people.

Higher parental socioeconomic status accelerates sexual debut: Evidence from university students in Italy

In this paper we analyze how the timing and type (protected or unprotected) of sexual debut are influenced by parental socioeconomic status (SES). We argue that depending on whether a "parental control" or a "cultural openness" mechanism prevails, one could find a postponing or an anticipating effect of higher parental SES on children's timing of sexual debut. By applying event-history techniques to unique data from the two releases of the Sexual and Emotional Life of Youths survey (2000 and 2017), we found a clear accelerating effect of higher parental SES-parental education and father's social class-on the sexual debut of Italian university students. The effect is partly mediated by family characteristics related to the cultural openness mechanism, such as low parental religiosity, greater communication about sex, and parental permissiveness; on the contrary, we only found weak support for the parental control explanation. Higher parental education is associated with a higher likelihood of protected first sexual intercourse-and especially of condom use-even if more precocious. Our results dispute the North American- and Anglo-Saxon-driven finding that high-SES children postpone their sexual debut.

Childbearing culture: a prominent context in the process of maternal role attainment in Iranian mothers with preterm neonates

Transition to the role of mothering is one of the most important events in a woman's life. While childbirth is a biological event, pregnancy and the experiences around it are more influenced by social structure, which is shaped by cultural perceptions and practices. The aim of this study was to explore cultural context during maternal role attainment in neonatal intensive care units (NICUs) in Iran. The study was part of a grounded theory study on how the mothers of preterm neonates go through maternal role attainment. Data collection was carried out by purposeful sampling from 20 participants (15 mothers of preterm neonates and 5 NICU nurses). Data were analysed according to Corbin and Strauss's (2015) approach. Four categories of childbearing culture emerged: 'The necessity of childbearing', 'Childbearing rituals', 'Maternal persistent presence' and 'Attitudes and religious beliefs'. The findings showed that the special beliefs and practices in Iranian culture affected all of the participants' reactions to mothering process. Culture is one of the most important factors affecting the development of motherhood in Iran. In order to provide sensitive and culturally appropriate care, nurses should be aware of the general impact of cultural norms and values on the process of maternal role attainment and strive to meet the cultural needs of all mothers.

Maternal age at birth and daughter's fecundability

STUDY QUESTION

Do daughters of older mothers have lower fecundability?

SUMMARY ANSWER

In this cohort study of North American pregnancy planners, there was virtually no association between maternal age ≥35 years and daughters' fecundability.

WHAT IS KNOWN ALREADY

Despite suggestive evidence that daughters of older mothers may have lower fertility, only three retrospective studies have examined the association between maternal age and daughter's fecundability.

STUDY DESIGN, SIZE, DURATION

Prospective cohort study of 6689 pregnancy planners enrolled between March 2016 and January 2020.

PARTICIPANTS/MATERIALS, SETTING, METHODS

Pregnancy Study Online (PRESTO) is an ongoing pre-conception cohort study of pregnancy planners (age, 21-45 years) from the USA and Canada. We estimated fecundability ratios (FR) for maternal age at the participant's birth using multivariable proportional probabilities regression models.

MAIN RESULTS AND THE ROLE OF CHANCE

Daughters of mothers ≥30 years were less likely to have previous pregnancies (or pregnancy attempts) or risk factors for infertility, although they were more likely to report that their mother had experienced problems conceiving. The proportion of participants with prior unplanned pregnancies, a birth before age 21, ≥3 cycles of attempt at study entry or no follow-up was greater among daughters of mothers <25 years. Compared with maternal age 25-29 years, FRs (95% CI) for maternal age <20, 20-24, 30-34, and ≥35 were 0.72 (0.61, 0.84), 0.92 (0.85, 1.00), 1.08 (1.00, 1.17), and 1.00 (0.89, 1.12), respectively.

LIMITATIONS, REASONS FOR CAUTION

Although the examined covariates did not meaningfully affect the associations, we had limited information on the participants' mother. Differences by maternal age in reproductive history, infertility risk factors and loss to follow-up suggest that selection bias may partly explain our results.

WIDER IMPLICATIONS OF THE FINDINGS

Our finding that maternal age 35 years or older was not associated with daughter's fecundability is reassuring, considering the trend towards delayed childbirth. However, having been born to a young mother may be a marker of low fecundability among pregnancy planners.

STUDY FUNDING/COMPETING INTEREST(S)

PRESTO was funded by NICHD Grants (R21-HD072326 and R01-HD086742) and has received in-kind donations from Swiss Precision Diagnostics, FertilityFriend.com, Kindara.com, and Sandstone Diagnostics. Dr Wise is a fibroid consultant for AbbVie, Inc.

TRIAL REGISTRATION NUMBER

n/a.

The Role of Fertility in the Demography of Grandparenthood: Evidence from Italy

Grandparents play an important role in their family’s lives. However, little is known about the demography of grandparenthood. Given dramatic recent changes in fertility, we explore the role of number of children and age at first birth in the timing of the transition into grandparenthood focusing on Italy, a country with well-known North-South fertility differentials. We used data from the 2009 Italian Survey ‘Family and Social Relations’ (N = 10,186) to estimate median ages of grandparenthood across three birth cohorts of parents (1920–29; 1930–39; 1940–49). Findings show an overall postponement of age of grandparenthood of 5 years, shifting for women from early to mid- or late-50s (in the South and North, respectively). Such postponement is largely driven by family compositional changes: although the age of grandparenthood among mothers of three or more children has not changed much over cohorts, the percentage of mothers with such characteristic decreased significantly. The heterogeneity in experiencing the transition to grandparenthood has implications for intergenerational transfers and other roles in later life.

Family formation patterns of children who experienced parental imprisonment

While it is widely recognized that imprisonment affects the lives of prisoners, there is increasing evidence that the consequences also extend to prisoners' children. Recently, several studies showed that the experience of parental imprisonment could also have an impact on family formation processes when children grow older. These previous studies, however, used relatively short follow-up periods, up to adolescence or early adulthood. The current study uses a Dutch multigenerational dataset with follow-ups at, on average, age 28 (N = 1147) and 47 (N = 1241), which makes it possible to also examine life events that usually occur later in life. Official registration data were used to examine the relationship of parental offending and parental incarceration with offspring's family formation patterns. Results show that children who experienced parental imprisonment were less likely to marry than those with parents who were never convicted. However, when they did marry, it was at a younger age and more often while being pregnant. Children of prisoners were also younger when they had their first child. Most of these differences were also found while comparing children of prisoners with children of convicted but not imprisoned parents. This suggests that these different family formation patterns are specifically related to the imprisonment of the parent rather than to the parent's criminal behavior.

Parents' Marital Quality and Children's Transition to Adulthood

Unique longitudinal measures from Nepal allow us to link both mothers' and fathers' reports of their marital relationships with a subsequent long-term record of their children's behaviors. We focus on children's educational attainment and marriage timing because these two dimensions of the transition to adulthood have wide-ranging, long-lasting consequences. We find that children whose parents report strong marital affection and less spousal conflict attain higher levels of education and marry later than children whose parents do not. Furthermore, these findings are independent of each other and of multiple factors known to influence children's educational attainment and marriage timing. These intriguing results support theories pointing toward the long-term intergenerational consequences of variations in multiple dimensions of parents' marriages.

The Role of Parents in Emerging Adults' Psychological Well-Being: A Person-Oriented Approach

The purpose of this study was to gain an overview of Spanish emerging adults' family relationships and their link with psychological well-being and psychological distress. The sample comprised 1502 undergraduate students (903 women and 599 men) aged between 18 and 29 (M = 20.32 and SD = 2.13), recruited from two universities in Spain. A cluster analysis identified three groups of families based on the centrality of five family variables: parental involvement, parental support for autonomy, parental warmth, behavioral control, and psychological control. The three groups or clusters were labeled high-quality family relationships (HQ), intermediate-quality family relationships (IQ), and low-quality family relationships (LQ). Women were overrepresented in the HQ cluster, whereas men were overrepresented in the IQ cluster. Moreover, emerging adults who perceived better family relationships (high levels of parental involvement, parental support for autonomy and parental warmth, and low levels of behavioral and psychological control) were found to have a higher level of psychological adjustment. Thus, our results indicate that family plays a key role in the psychological well-being of emerging adults. The discussion focuses on the implications of this finding for the parent-child relationship, and explores how it extends our knowledge about family relationships during emerging adulthood.

Intergenerational Transmission of Multipartner Fertility

Using data from administrative registers for the period 1970–2007 in Norway and Sweden, we investigate the intergenerational transmission of multipartner fertility. We find that men and women with half-siblings are more likely to have children with more than one partner. The differences are greater for those with younger versus older half-siblings, consistent with the additional influence of parental separation that may not arise when one has only older half-siblings. The additional risk for those with both older and younger half-siblings suggests that complexity in childhood family relationships also contributes to multipartner fertility. Only a small part of the intergenerational association is accounted for by education in the first and second generations. The association is to some extent gendered. Half-siblings are associated with a greater risk of women having children with a new partner in comparison with men. In particular, maternal half-siblings are more strongly associated with multipartner fertility than paternal half-siblings only for women.

Education, Other Socioeconomic Characteristics Across the Life Course, and Fertility Among Finnish Men

The level of education and other adult socioeconomic characteristics of men are known to associate with their fertility, but early-life socioeconomic characteristics may also be related. We studied how men’s adult and early-life socioeconomic characteristics are associated with their eventual fertility and whether the differences therein by educational level are explained or mediated by other socioeconomic characteristics. The data on men born in 1940–1950 (N = 37,082) were derived from the 1950 Finnish census, which is linked to later registers. Standard and sibling fixed-effects Poisson and logistic regression models were used. Education and other characteristics were positively associated with the number of children, largely stemming from a higher likelihood of a first birth among the more socioeconomically advantaged men. The educational gradient in the number of children was not explained by early socioeconomic or other characteristics shared by brothers, but occupational position and income in adulthood mediated approximately half of the association. Parity-specific differences existed: education and many other socioeconomic characteristics predicted the likelihood of a first birth more strongly than that of a second birth, and the mediating role of occupational position and income was also strongest for first births. Relatively small differences were found in the likelihood of a third birth. In men, education is positively associated with eventual fertility after controlling for early socioeconomic and other characteristics shared by brothers. Selective entry into fatherhood based on economic provider potential may contribute considerably to educational differentials in the number of children among men.

Parental Education and Family Dissolution: A Cross-National and Cohort Comparison

This is the first study to systematically analyze whether the association between parental education and family dissolution varies cross-nationally and over time. The authors use meta-analytic tools to study cross-national variation between 17 countries with data from the Generations and Gender Study and Harmonized Histories. The association shows considerable cross-national variation, but is positive in most countries. The association between parental education and family dissolution has become less positive or even negative in six countries. The findings show that the association between parental education and family dissolution is generally positive or nil, even if the association between own education and family dissolution is in many countries increasingly negative. The authors find suggestive evidence that the association is related to the crude divorce rate, but not to the generosity of the welfare state in these countries. The implications of these findings for understanding the stratification in family dissolution are discussed.

Reproductive ageing-turning back the clock?

BACKGROUND

Unintended childlessness is a distressing, and often unintended, consequence of delayed childbearing and reproductive ageing. The average maternal age at first birth has risen steadily in many industrialised countries since the 1980s. There are many societal factors involved in the decision to postpone motherhood. As a result, many women are postponing having children until it is too late. In this review, we aim to summarise the reasons behind delayed childbearing, the impact of delayed childbearing and the scientific advances that seek to reverse reproductive ageing and ensure reproductive autonomy for women.

METHODS

An extensive literature search of PubMed was conducted to include all published articles on delayed childbearing and the consequences of reproductive ageing. Secondary articles were identified from key paper reference listings.

CONCLUSION

If the current reproductive trends continue, many women will find themselves in the harrowing position of being unintentionally childless. In addition, many will inevitably turn to assisted reproductive technologies in an effort to protect and preserve their reproductive autonomy. However, it is not always possible to reverse the effects of reproductive ageing.

Is the Association Between Education and Fertility Postponement Causal? The Role of Family Background Factors

A large body of literature has demonstrated a positive relationship between education and age at first birth. However, this relationship may be partly spurious because of family background factors that cannot be controlled for in most research designs. We investigate the extent to which education is causally related to later age at first birth in a large sample of female twins from the United Kingdom (N = 2,752). We present novel estimates using within-identical twin and biometric models. Our findings show that one year of additional schooling is associated with about one-half year later age at first birth in ordinary least squares (OLS) models. This estimate reduced to only a 1.5-month later age at first birth for the within-identical twin model controlling for all shared family background factors (genetic and family environmental). Biometric analyses reveal that it is mainly influences of the family environment-not genetic factors-that cause spurious associations between education and age at first birth. Last, using data from the Office for National Statistics, we demonstrate that only 1.9 months of the 2.74 years of fertility postponement for birth cohorts 1944-1967 could be attributed to educational expansion based on these estimates. We conclude that the rise in educational attainment alone cannot explain differences in fertility timing between cohorts.

Fertility Patterns Among Turkish Women in Turkey and Abroad: The Effects of International Mobility, Migrant Generation, and Family Background

In this paper, we examine the fertility behavior of Turkish women in Europe from a context-of-origin perspective. Women with different migration biographies (first-generation, 1.5-generation, second-generation migrants, and return migrants) are compared with "stayer" women from the same regions of origin in Turkey. This approach provides us with new insights into the study of the effects of international migrations. First-, second-, and third-birth transitions are analyzed using data from the 2000 Families Study, which was conducted in 2010 and 2011 in Turkey and in western Europe. The classical hypotheses of disruption, interrelated events, adaptation, socialization, and selectivity/composition are developed with reference to the context-of-origin perspective. To account for socialization and family-related composition effects, we also look at family characteristics. Our findings provide no support for the disruption hypothesis, but suggest that the first-generation migrant women have higher first-birth risks than the stayers. However, this gap can be fully explained by differences in marriage duration. Differences in composition-namely in educational attainment-account for our finding that the second migrant generation has lower first-birth transition rates than the women in Turkey. Except for the number of siblings, the family influence, including the processes of intergenerational transmission, is minor and hardly accounts for the migrant-stayer differences in birth transitions. Most remarkably, the analyses show that the second- and third-birth risks of almost all of the migrant groups are higher than those of the women in Turkey, when individual and family factors are held constant; which suggests that there is a fertility crossover between the origin and the destination contexts.

Postponing parenthood to advanced age

The aim of the Postponing Parenthood project was to investigate several aspects of the delaying of childbearing phenomenon in Sweden and Norway, such as medical risks and parental experiences. Data were retrieved from the Swedish and Norwegian Medical Birth Registers and three different cohorts: the Swedish Young Adult Panel Study, the Norwegian Mother and Child Cohort, and the Swedish Women's Experiences of Childbirth cohort. Postponing childbirth to age 35 years and later increased the risk of rare but serious pregnancy outcomes, such as stillbirth and very preterm birth. Older first-time parents were slightly more anxious during pregnancy, and childbirth overall was experienced as more difficult, compared with younger age groups. First-time mothers' satisfaction with life decreased from about age 28 years, both when measured during pregnancy and early parenthood. Delaying parenthood to mid-30 or later was more related to lifestyle than socioeconomic factors, suggesting that much could be done in terms of informing young persons about the limitations of fertility and assisted reproductive techniques, and the risks associated with advanced parental age.

Number of children and later-life mortality among Finns born 1938-50

We investigated the association between number of offspring and later-life mortality of Finnish men and women born 1938-50, and whether the association was explained by living conditions in own childhood and adulthood, chronic conditions, fertility timing, and unobserved characteristics common to siblings. We used a longitudinal 1950 census sample to estimate mortality at ages 50-72. Relative to parents of two children, all-cause mortality is highest among childless men and women, and elevated among those with one child, independently of observed confounders. Fixed-effect models, which control for unobserved characteristics shared by siblings, clearly support these findings among men. Cardiovascular mortality is higher among men with no, one, or at least four children than among those with two. Living conditions in adulthood contribute to the association between the number of children and mortality to a greater extent than childhood background, and chronic conditions contribute to the excess mortality of the childless.

Human fertility, molecular genetics, and natural selection in modern societies

Research on genetic influences on human fertility outcomes such as number of children ever born (NEB) or the age at first childbirth (AFB) has been solely based on twin and family-designs that suffer from problematic assumptions and practical limitations. The current study exploits recent advances in the field of molecular genetics by applying the genomic-relationship-matrix based restricted maximum likelihood (GREML) methods to quantify for the first time the extent to which common genetic variants influence the NEB and the AFB of women. Using data from the UK and the Netherlands (N = 6,758), results show significant additive genetic effects on both traits explaining 10% (SE = 5) of the variance in the NEB and 15% (SE = 4) in the AFB. We further find a significant negative genetic correlation between AFB and NEB in the pooled sample of –0.62 (SE = 0.27, p-value = 0.02). This finding implies that individuals with genetic predispositions for an earlier AFB had a reproductive advantage and that natural selection operated not only in historical, but also in contemporary populations. The observed postponement in the AFB across the past century in Europe contrasts with these findings, suggesting an evolutionary override by environmental effects and underscoring that evolutionary predictions in modern human societies are not straight forward. It emphasizes the necessity for an integrative research design from the fields of genetics and social sciences in order to understand and predict fertility outcomes. Finally, our results suggest that we may be able to find genetic variants associated with human fertility when conducting GWAS-meta analyses with sufficient sample size.

Still childless at the age of 32: An investigation of predictors in 22-year-old women and men

Aim: The aim of this study was to investigate if family background and attitudes in early adulthood contribute to postponement of parenthood. Postponement of parenthood is associated with increased need for artificial reproductive techniques, increased risk for adverse pregnancy outcomes and reduced fertility rates. Methods: This was a cohort study including 1000 women and men aged 22 years from the Swedish Young Adult Panel Study. Questionnaire data were linked to information from the Swedish Total Population Register 10 years later. Logistic regression analyses were conducted. Results: Background factors associated with being childless were: being second-generation Polish or Turkish (odds ratio [OR] 1.5; 95% confidence intervals [CI] 1.2–2.0), growing up in a large city (OR 1.5; 95% CI 1.1–2.0), well-educated mother (OR 1.5; 95% CI 1.1–1.9) or father (OR 1.4; 95% CI 1.1–1.9), no siblings (OR 1.9; 95% CI 1.1–3.2), living in parental home (OR 2.2; 95% CI 1.6–3.1), less than good assessment of own mother (OR 1.8; 95% CI 1.2–2.7) or father (OR 1.4; 95% CI 1.0–1.9) as a parent, and less than satisfactory relationship with own mother (OR 1.5; 95% CI 1.1–2.1). Attitudes associated with being childless were: not enjoying children (OR 2.7; 95% CI 2.0–3.6), finding that one could be satisfied in life without being a good parent (OR 2.3; 95% CI 1.7–3.0) and not assuming that one will have children in the future (OR 2.9; 95% CI 2.1–3.9). Conclusions: The findings suggest that postponement of parenthood to the age of 32 could partly be explained by family background and negative or ambivalent attitudes to children and parenthood in early adulthood.

Effect of family background on the educational gradient in lifetime fertility of Finnish women born 1940-50

An inverse association between education and fertility in women has been found in many societies but the causes of this association remain inadequately understood. We investigated whether observed and unobserved family-background characteristics explained educational differences in lifetime fertility among 35,212 Finnish women born in 1940-50. Poisson and logistic regression models, adjusted for measured socio-demographic family-background characteristics and for unobserved family characteristics shared by siblings, were used to analyse the relationship between education and the number of children, having any children, and fertility beyond the first child. The woman's education and the socio-economic position of the family were negatively associated with fertility. Observed family characteristics moderately (3-28 per cent) explained the association between education and fertility, and results from models including unobserved characteristics supported this interpretation. The remaining association may represent a causal relationship between education and fertility or joint preferences that form independently of our measures of background.

Educational Differences in Completed Fertility: A Behavioral Genetic Study of Finnish Male and Female Twins

Despite the large body of research on educational differences in fertility, how genetic and environmental influences may contribute to educational differences in completed fertility is not well understood. This study examines the association between educational level and completed fertility in a sample of Finnish male and female twins born between 1950 and 1957 with register-based fertility follow-up until 2009. The results show that poorly educated men and highly educated women are least likely to have any children and have lower completed fertility in general. Behavioral genetics analysis suggests that the association between education and having any children in both sexes is influenced by factors shared by co-twins and that these factors are genetic rather than common environmental. No evidence of a causal pathway between education and having any children independent of these shared influences is found. These findings suggest that familial factors may play a role in the process through which educational differences in completed fertility are formed.