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Cultural evolutionary theory and human behavioural ecology offer different, but compatible approaches to understanding human demographic behaviour. For much of their 30 history, these approaches have been deployed in parallel, with few explicit attempts to integrate them empirically. In this paper, we test hypotheses drawn from both approaches to explore how reproductive behaviour responds to cultural changes among Mosuo agriculturalists of China. Specifically, we focus on how age at last birth (ALB) varies in association with temporal shifts in fertility policies, spatial variation and kinship ecologies. We interpret temporal declines in ALB as plausibly consistent with demographic front-loading of reproduction in light of fertility constraints and later ages at last birth in matrilineal populations relative to patrilineal ones as consistent with greater household cooperation for reproductive purposes in the former. We find little evidence suggesting specific transmission pathways for the spread of norms regulating ALB, but emphasize that the rapid pace of change strongly suggests that learning processes were involved in the general decline in ALB over time. The different predictions of models we employ belie their considerable overlap and the potential for a synthetic approach to generate more refined tests of evolutionary hypotheses of demographic behaviour. This article is part of the theme issue ‘Bridging cultural gaps: interdisciplinary studies in human cultural evolution’.

Background Women in their reproductive age have tremendous health implications that affect their health and well-being. Anaemia is an indicator of inadequate dietary intake and poor health. Maternal malnutrition significantly impacts maternal and child health outcomes, increasing the mother's risk of dying during delivery. High-risk fertility behaviour is a barrier to reducing mother and child mortality. This study aims to examine the level of high-risk fertility behaviour and anaemia among ever-married urban Indian women and also examine the linkages between the both. Methods Based on the National Family Health Survey's fifth round of data, the study analyzed 44,225 samples of ever-married urban women. Univariate and bivariate analysis and binary logistic regression have been used for the analysis. Results Findings suggested that more than half (55%) of the urban women were anaemic, and about one-fourth (24%) of women had any high-risk fertility behaviour. Furthermore, the results suggest that 20% of women were more vulnerable to anaemia due to high-risk fertility behaviour. For the specific category, 19% and 28% of women were more likely to be anaemic due to single and multiple high-risk fertility. However, after controlling for sociodemographic factors, the findings showed a statistically significant link between high-risk fertility behaviour and anaemia. As a result, 16% of the women were more likely to be anaemic due to high-risk fertility behaviour, and 16% and 24% were more likely to be anaemic due to single and multiple high-risk fertility behaviour, respectively. Conclusions The findings exposed that maternal high-risk fertility behaviour is a significant factor in raising the chance of anaemia in ever-married urban women of reproductive age in forms of the short birth interval, advanced maternal age, and advanced maternal age & higher order. Policy and choice-based family planning techniques should be employed to minimize the high-risk fertility behaviour among Indian urban women. This might aid in the reduction of the malnutrition status of their children.

Background One in three women from lower and middle-income countries are subjected to physical and/or sexual intimate partner violence (IPV) in their life span. Prior studies have highlighted a range of adverse health impacts of sexual IPV. However, less is known about the link between multiple high-risk fertility behaviours and sexual intimate partner violence. The present study examines the statistical association between multiple high-risk fertility behaviours and sexual intimate partner violence among women in India. Methods The present study used a nationally representative dataset, the National Family Health Survey (NFHS-4) 2015–16. A total of 23,597 women were included in the study; a subsample of married women of reproductive age who have had at least one child 5 years prior to the survey and who had valid information about sexual IPV. Logistic regression models were employed alongside descriptive statistics. Results Approximately 7% of women who are or had been married face sexual IPV. The prevalence of sexual violence was higher among women who had short birth intervals and women who had given birth more than three times (12%). Around 11% of women who had experienced any high-risk fertility behaviours also experienced sexual violence. The unadjusted association suggested that multiple high-risk fertility behaviours were 32% (UORs = 1.32, 95% CI: 1.16–1.50) higher for those women who experienced sexual violence. After adjusting for other sociodemographic variables, except for women’s education and wealth quantile, the odds of multiple high-risk fertility behaviours were 16% (AOR = 1.16; 95% CI: 1.02–1.34) higher among women who faced sexual violence. The inclusion of women’s educational attainment and wealth status in the model made the association between sexual IPV and high-risk fertility behaviours insignificant. Conclusion Sexual intimate partner violence is statistically associated with high-risk fertility behaviours among women in India. Programs and strategies designed to improve women’s reproductive health should investigate the different dimensions of sexual IPV in India.

This paper assesses whether fertility theories are still relevant in explaining fertility behaviour in the era of modernization of societies in sub-Saharan Africa over the past six decades. The paper particularly focuses on five classical fertility theories: Child Survival Hypothesis, Intergenerational Flow of Wealth, Relative Income Hypothesis, Demand and Supply Framework of Fertility and Value of Children Theory. A rapid scoping review of five classical fertility theories and empirical literature on fertility in sub-Saharan Africa and other developing regions was done using data sources such as PubMed, Scopus, ScienceDirect, EBSCO, MEDLINE and JSTOR. Three arguments are made. First, the theories of fertility provide some form of understanding of how traditional values and institutions encourage high fertility behaviour in traditional African societies. Second, even though some fertility theories predicted a fall in fertility with the emergence of modernity, empirical research and statistical evidence showed no significant reduction in general fertility levels. Last, empirical studies in the African subregion have acknowledged the presence of such modern institutions and have found that these institutions have influenced the fertility decisions of many within the subregion. What is theoretically expected to occur in terms of fertility reduction is moderate. In effect, traditional values still play a vital role in fertility behaviour and are deeply entrenched in fertility decisions in the subregion.

Numerous studies have explored the influences of family policies, such as formal childcare use, and migration on fertility, with mixed findings. However, limited research has examined how formal childcare use (or the lack thereof) affects both fertility intentions and behaviours among native and migrant women. This study uses Italy as a case study, where the familistic welfare system creates challenges in work–family reconciliation and female workforce participation, particularly for migrant women facing precarious jobs and higher fertility. This results in employment disparities between migrant and native women, especially among mothers. Using the 2012 Birth Sample Survey from the Italian National Institute of Statistics, we address two research questions: (i) Does formal childcare use for one child positively influence mothers' fertility intentions and behaviours to have another? (ii) Does this effect vary according to migration background? We apply multinomial logistic regression models to analyse the relationship between mothers' fertility intentions and behaviours and childcare use by migration background, migratory generation, and partner's nationality. Our results show that mothers using formal childcare—either stable or occasional—are more likely to have positive fertility behaviours than those with unmet needs, with differences by migration background. Among mothers using formal care, natives show higher positive short-term fertility intentions than migrants, while natives with unmet childcare needs are less likely to have another child than migrants. While formal childcare has limited effect on fertility, unmet childcare needs emerge as a crucial factor, highlighting the need for policies addressing broader socio-economic and cultural factors shaping fertility decisions.

Background Evidence suggests that women who give birth in a health facility have lower odds of experiencing pregnancy complications and significantly reduced risk of death from pregnancy-related causes compared to women who deliver at home. Establishing the association between high-risk fertility behaviour (HRFB) and health facility delivery is imperative to inform intervention to help reduce maternal mortality. This study examined the association between HRFB and health facility delivery in West Africa. Methods Data for the study were extracted from the most recent Demographic and Health Surveys of twelve countries in West Africa conducted from 2010 to 2020. A total of 69,479 women of reproductive age (15–49 years) were included in the study. Place of delivery was the outcome variable in this study. Three parameters were used as indicators of HRFB based on previous studies. These were age at first birth, short birth interval, and high parity. Multivariable binary logistic regression analysis was performed to examine the association between HRFB and place of delivery and the results were presented using crude odds ratio (cOR) and adjusted odds ratio (aOR), with their respective 95% confidence interval (CI). Results More than half (67.64%) of the women delivered in a health facility. Women who had their first birth after 34 years (aOR = 0.52; 95% CI = 0.46–0.59), those with short birth interval (aOR = 0.91; 95% CI = 0.87–0.96), and those with high parity (aOR = 0.58; 95% CI = 0.55–0.60) were less likely to deliver in a health compared to those whose age at first delivery was 18-34 years, those without short birth interval, and those with no history of high parity, respectively. The odds of health facility delivery was higher among women whose first birth occurred at an age less than 18 years compared to those whose age at first birth was 18-34 years (aOR = 1.17; 95% CI = 1.07–1.28). Conclusion HRFB significantly predicts women's likelihood of delivering in a health facility in West Africa. Older age at first birth, shorter birth interval, and high parity lowered women’s likelihood of delivering in a health facility. To promote health facility delivery among women in West Africa, it is imperative for policies and interventions on health facility delivery to target at risk sub-populations (i.e., multiparous women, those with shorter birth intervals and women whose first birth occurs at older maternal age). Contraceptive use and awareness creation on the importance of birth spacing should be encouraged among women of reproductive age in West Africa.

Background Women’s high-risk fertility behavior (HRFB), which is characterized by narrow birth intervals, high birth order, and younger maternal age at birth, have been scientifically reported to have detrimental effects on the mother and child’s health. To date, there has been limited research into the underlying factors contributing to high-risk fertility behavior in Kenya. Thus, the aim of this study is to identify the factors associated with high-risk fertility behavior among women of reproductive age in Kenya. Method The 2022 Kenyan Demography and Health Survey data was used for the current study. This study included 15,483 women of reproductive age. To account for the clustering effects of DHS data and the binary nature of the outcome variable, a multilevel binary logistic regression model was applied. An adjusted odds ratio with a 95% confidence interval was reported to declare the statistical significance. In addition, the model that had the lowest deviance was the one that best fit the data. Results The overall prevalence of HRFB among Kenyan women were 70.86% (95%CI = 69.96, 71.40). Women with primary, secondary, and higher educational levels, Protestant and Muslim religion followers, women whose husbands/partners had secondary and higher educational levels, a high household wealth index, ever had a terminated pregnancy, and rural residence, all of these factors were found to be strongly associated with high-risk fertility behavior. Conclusion As per the findings of our study, in Kenya a significant proportion of women has experienced HRFB. This is a matter of concern as it poses a significant challenge to the healthcare system. The high prevalence of HRFB indicates that there is an urgent need to take appropriate measures in order to mitigate its impact. The situation calls for a comprehensive and coordinated approach involving all stakeholders to address this issue effectively. It would benefit policymakers to create programs that consider factors like education, wealth, and residence that make women more susceptible to HRFB. Targeting women living in high HRFB-prevalence areas could help address the root causes of the issue. This approach can alleviate negative impacts and ensure effective and sustainable solutions.

Background We aimed to determine the factors that increase the risk of HRFB in Bangladeshi women of reproductive age 15–49 years. Methods The study utilised the latest Bangladesh Demographic and Health Survey (BDHS) 2017–18 dataset. The Pearson's chi-square test was performed to determine the relationships between the outcome and the independent variables, while multivariate logistic regression analysis was used to identify the potential determinants associated with HRFB. Results Overall 67.7% women had HRFB among them 45.6% were at single risk and 22.1% were at multiple high-risks. Women’s age (35–49 years: AOR = 6.42 95% CI 3.95–10.42), who were Muslims(AOR = 5.52, 95% CI 2.25–13.52), having normal childbirth (AOR = 1.47, 95% CI 1.22–1.69), having unwanted pregnancy (AOR = 10.79, 95% CI 5.67–18.64) and not using any contraceptive methods  (AOR = 1.37, 95% CI 1.24–1.81) were significantly associated with increasing risk of having HRFB. Alternatively, women and their partners’ higher education were associated with reducing HRFB. Conclusion A significant proportion of Bangladeshi women had high-risk fertility behaviour which is quite alarming. Therefore, the public health policy makers in Bangladesh should emphasis on this issue and design appropriate interventions to reduce the maternal HRFB. Plain Language Summary High rates of maternal high-risk fertility behaviour (HRFB) have a variety of unfavourable repercussions for both the mother and the child. However, because there have been few studies on this topic to date, we set out to identify the determinants that enhance the risk of HRFB in Bangladeshi women between the ages of 15 and 49. Using latest demographic and health survey (BDHS) data we have found that 67.7% of women had HRFB, with 45.6% having a single high-risk factor and 22.1% having multiple high-risk factors. This high prevalence rate demonstrates that HRFB are all too common in Bangladesh, potentially endangering the health of the country's women. We found that women practicing Islam as core religion, age above 35 years, having normal childbirth, having above 3 children, having unwanted pregnancies and not using birth control methods were at increased risk of having HRFB. As a result of the study's findings, interventions are urgently needed to prevent high-risk fertility behaviour among Bangladeshi women aged 15 to 49 years.

In October 2015, the Chinese Government announced that the one-child policy had finally been replaced by a universal two-child policy. China’s universal two-child policy is highly significant because, for the first time in 36 years, no one in an urban city is restricted to having just one child. This cross-sectional study was conducted to explore future fertility intentions and factors influencing individual reproductive behaviour (whether to have two children) in Dalian City. A total of 1370 respondents were interviewed. The respondents’ mean ideal number of children was only 1.73, and urban respondents’ sex preference was symmetrical. A total of 19.0% of the respondents were unmarried, 64.5% were married and had childbearing experience and only 6.3% of married respondents had two children. Among the 1370 participants, 30.4% stated that they would have a second child, while 69.6% refused to have a second child in the future. Binary logistic regression analysis (Model 1) showed that the following characteristics were associated with having only one child in the future: being female, being older, having a lower education level, being born in Dalian, having a lower family income and reporting one child as the ideal number of children. Model 2 (comprising only respondents with childbearing experience) showed that respondents who were female, had a lower family income and were unable to obtain additional financial support from parents were more likely to intend to stick at one child. In addition, respondents’ ideal number of children and childbearing experiences had a significant influence on future fertility intentions. These results suggest that fertility intentions and reproductive behaviours are still below those needed for replacement level fertility in Dalian City. China’s policymakers should pay more attention to these factors (socioeconomic characteristics, economic factors, desired number of children and childbearing experiences) and try to increase individual reproductive behaviour.

Background Maternal age < 18 or > 34 years, short inter-pregnancy birth interval, and higher birth order are considered to be high-risk fertility behaviours (HRFB). Underfive mortality being disproportionately concentrated in Asia and Africa, this study analyses the association between HRFB and underfive mortality in selected Asian and African countries. Methods This study used Integrated Public Microdata Series-Demographic and Health Surveys (IPUMS-DHS) data from 32 countries in sub-Saharan Africa, Middle East, North Africa and South Asia from 1986 to 2017 ( N  = 1,467,728). Previous evidence hints at four markers of HRFB: women’s age at birth of index child < 18 or > 34 years, preceding birth interval < 24 months and child’s birth order > 3. Using logistic regression, we analysed change in the odds of underfive mortality as a result of i) exposure to HRFB individually, ii) exposure to any single HRFB risk factor, iii) exposure to multiple HRFB risk factors, and iv) exposure to specific combinations of HRFB risk factors. Results Mother’s age at birth of index child < 18 years and preceding birth interval (PBI) < 24 months were significant risk factors of underfive mortality, while a child’s birth order > 3 was a protective factor. Presence of any single HRFB was associated with 7% higher risk of underfive mortality (OR 1.07; 95% CI 1.04–1.09). Presence of multiple HRFBs was associated with 39% higher risk of underfive mortality (OR 1.39; 95% CI 1.36–1.43). Some specific combinations of HRFB such as maternal age < 18 years and preceding birth interval < 24 month significantly increased the odds of underfive mortality (OR 2.07; 95% CI 1.88–2.28). Conclusion Maternal age < 18 years and short preceding birth interval significantly increase the risk of underfive mortality. This highlights the need for an effective legislation to curb child marriages and increased public investment in reproductive healthcare with a focus on higher contraceptive use for optimal birth spacing.