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American Wild: it can kill you, or exhilarate you. It's always there, a character in its own right in the great unfolding narrative of American writing. This issue of Granta is dedicated to stories of the wild, from MELINDA MOUSTAKIS on gutting fish in Alaska to CLAIRE VAYE WATKINS on a lost child in a dystopian California. Also: ANTHONY DOERR on a family of pioneers in Idaho, ADAM NICOLSON on tracking wolves in New Mexico and DAVID TREUER on cage fighting and his Ojibwe heritage.

Breastfeeding duration is associated with improved cognitive development in children, but it is unclear whether this is a causal relationship or due to confounding. This study evaluates whether the observed association is explained by socioeconomic position (SEP) and maternal cognitive ability. Data from 7,855 singletons born in 2000-2002 and followed up to age 14 years within the UK Millennium Cohort Study were analysed. Mothers reported breastfeeding duration, and children's cognitive abilities were assessed at 5, 7, 11, and 14 years using validated measures. Standardised verbal (age 5 to 14) and spatial (age 5 to 11) cognitive scores were compared across breastfeeding duration groups using multivariable linear mixed-effects models (repeated outcome measures). At all ages, longer breastfeeding durations were associated with higher cognitive scores after accounting for the child's own characteristics. Adjustment for SEP approximately halved the effect sizes. Further adjustment for maternal cognitive scores removed the remaining associations at age 5, but not at ages 7, 11 and 14 (e.g.: verbal scores, age 14; breastfed ≥12 months vs never breastfed: 0.26 SD; 95%CI: 0.18, 0.34). The associations between breastfeeding duration and cognitive scores persist after adjusting for SEP and maternal cognitive ability, however the effect was modest.

Exposure to tobacco products during pregnancy presents a potential harm to both mother and baby. This study sought to estimate the prevalence of vaping during pregnancy and to explore the factors and outcomes associated with vaping in pregnancy. England. Women who gave birth between 15th and 28th October 2017. A cross-sectional population-based postal survey of maternal and infant health, the National Maternity Survey (NMS) 2018. The prevalence of vaping and patterns of cigarette smoking were estimated, and regression analysis was used to explore associations between maternal characteristics and vaping, and between vaping and birth outcomes. Unweighted and weighted prevalence of vaping with 95% confidence intervals, and unadjusted and adjusted relative risks or difference in means for the association of participant characteristics and secondary outcomes with vaping. Secondary outcome measures were: preterm birth, gestational age at birth, birthweight, and initiation and duration of breastfeeding. A total of 4,509 women responded to the survey. The prevalence of vaping in pregnancy was 2.8% (95%CI 2.4% to 3.4%). This varied according to the pattern of cigarette smoking in pregnancy: 0.3% in never-smokers; 3.3% in ex-smokers; 7.7% in pregnancy-inspired quitters; 9.5% in temporary quitters; and 17.7% in persistent smokers. Younger women, unmarried women, women with fewer years of formal education, women living with a smoker, and persistent smokers were more likely to vape, although after adjusting for pattern of cigarette smoking and maternal characteristics, persistent smoking was the only risk factor. We did not find any association between vaping and preterm birth, birthweight, or breastfeeding. The prevalence of vaping during pregnancy in the NMS 2018 was low overall but much higher in smokers. Smoking was the factor most strongly associated with vaping. Co-occurrence of vaping with persistent smoking has the potential to increase the harms of tobacco exposure in pregnant women and their infants.

Preterm birth (<37 weeks’ gestation) is a risk factor for poor educational outcomes. A dose-response effect of earlier gestational age at birth on poor primary school attainment has been observed, but evidence for secondary school attainment is limited and focused predominantly on the very preterm (<32 weeks) population. We examined the association between gestational age at birth and academic attainment at the end of primary and secondary schooling in England. Data for children born in England from 2000–2001 were drawn from the population-based UK Millennium Cohort Study. Information about the child’s birth, sociodemographic factors and health was collected from parents. Attainment on national tests at the end of primary (age 11) and secondary school (age 16) was derived from linked education records. Data on attainment in primary school was available for 6,950 pupils and that of secondary school was available for 7,131 pupils. Adjusted relative risks (aRRs) for these outcomes were estimated at each stage separately using modified Poisson regression. At the end of primary school, 17.7% of children had not achieved the expected level in both English and Mathematics and this proportion increased with increasing prematurity. Compared to full term (39–41 weeks) children, the strongest associations were among children born moderately (32–33 weeks; aRR = 2.13 (95% CI 1.44–3.13)) and very preterm (aRR = 2.06 (95% CI 1.46–2.92)). Children born late preterm (34–36 weeks) and early term (37–38 weeks) were also at higher risk with aRR = 1.18 (95% CI 0.94–1.49) and aRR = 1.21 (95% CI 1.05–1.38), respectively. At the end of secondary school, 45.2% had not passed at least five General Certificate of Secondary Education examinations including English and Mathematics. Following adjustment, only children born very preterm were at significantly higher risk (aRR = 1.26 (95% CI 1.03–1.54)). All children born before full term are at risk of poorer attainment during primary school compared with term-born children, but only children born very preterm remain at risk at the end of secondary schooling. Children born very preterm may require additional educational support throughout compulsory schooling.

Background Childhood and adolescence are critical periods of emotional and psychological development, during which socioeconomic factors such as family income may have varying effects on mental health. While previous research suggests that children from lower-income families tend to have poorer mental health outcomes, it is unclear how this association changes with age. Understanding these patterns is essential for designing interventions that target the most vulnerable periods in development. This study investigates the relationship between family income and mental health across childhood and adolescence in the UK, identifying potential age-related changes in the strength of this association. Methods A sample of 5667 children from the UK Millennium Cohort Study was followed from ages 3 to 17 years. Overall mental health problems, internalising and externalising problems were measured using the Strengths and Difficulties Questionnaire. Family income was assessed using inflation-adjusted annual family income, adjusted for family size and composition, and a binary indicator of poverty status. Panel data linear fixed-effects models were used to control for unobserved heterogeneity. Results Higher family income was associated with better child mental health, but the magnitude of the effect varied with age. After adjustment for confounders, lower income predicted poorer overall mental health at ages 11 and 14 years, with the strongest association observed at 14. Weak association was found at ages 3, 5, 7, and 17. A similar trend was observed for externalising problems, while the income protective effect on internalising problems showed a significant increase with age. No substantial sex differences were observed in these associations. Conclusions Child mental health-income gradient exists in the UK and varies with age, being stronger in adolescence than childhood, and for internalising symptoms. Family income interventions/redistributions in early adolescence are more likely to reduce mental health problems in young people.

To examine the prevalence of the maternal postnatal six-week check (SWC) in women with epilepsy compared to a sample of the postnatal population without epilepsy, and assess whether the SWC is associated with health outcomes in the first year postpartum. Clinical Practice Research Datalink Aurum and Hospital Episode Statistics data were used to identify births between January1998-March2020 to women with epilepsy (n = 23,533) and a random sample of births to women without epilepsy (n = 317,369). The adjusted risk ratio (aRR) for not having a SWC in women with compared to without epilepsy was estimated using modified Poisson regression. The association between receiving a SWC and postpartum health outcomes was assessed using Cox regression. The likelihood of not having a SWC did not differ between those with and without epilepsy (42.7% vs 43.4%, aRR = 1.01, 95%CI = 0.99-1.03). Among all women, not having a SWC was associated with a lower subsequent likelihood of being prescribed prophylactic (aHR = 0.59, 95%CI = 0.58-0.60) and emergency (aHR = 0.95, 95%CI = 0.91-0.99) contraception and having urinary and/or faecal incontinence (aHR = 0.67, 95%CI = 0.61-0.73) or dyspareunia, perineal and/or pelvic pain (aHR = 0.70, 95%CI = 0.65-0.75) recorded in the year postpartum, with no evidence these associations differed according to whether a woman had epilepsy. Not having a SWC was also associated with a lower likelihood of having depression and/or anxiety recorded in the first year postpartum among those without (aHR = 0.86, 95%CI = 0.84-0.89) but not with epilepsy (aHR = 1.01, 95%CI = 0.93-1.09). The SWC was not associated with epilepsy relevant outcomes (Accident and emergency visits or unplanned hospital admission for epilepsy, mortality). Around 2 in every 5 women had no evidence of a maternal SWC, with no evidence epileptic women had a different prevalence to the general postnatal population. The maternal SWC may play a role in increasing the use of contraception and the detection or treatment of adverse health outcomes in the first year postpartum.

Prelacteal feeding (PLF) is a recognised challenge to optimal breastfeeding but remains common in Indonesia. Meanwhile, PLF-related epidemiological research is limited, particularly in this setting. This study examines the prevalence and determinants of overall PLF as well as common PLF types (formula, other milk, and honey) in Indonesia. Data from 6127 mothers whose last child was ≤23-month-old were drawn from the 2017 Indonesia Demographic and Health Survey. Multivariable modified Poisson regression was used to measure the prevalence ratio (PR) for selected PLF risk factors. PLF was defined as anything to drink other than breast milk within three days after birth, before breastmilk flows. Additional analyses were performed on mothers who gave formula, other milk, and honey. About 45% babies in Indonesia received PLF with formula being the most frequent (25%), followed by other milk (14%), plain water (5%), and honey (3%). Factors associated with higher prevalence of any PLF were higher wealth quintiles in rural area (PR 1.07; 95% CI 1.03-1.11 per increase in quintile), baby perceived to be small at birth (PR 1.23; 95% CI 1.12-1.35), caesarean deliveries at either public (PR 1.27; 95% CI 1.13-1.44) or private facilities (PR 1.15; 95% CI 1.01-1.31), and not having immediate skin-to-skin contact after birth (PR 1.32; 95% CI 1.23-1.42). PLF was less prevalent among mothers who gave birth to second/subsequent child (PR 0.82; 95% CI 0.76-0.88) and who had an antenatal card (PR 0.89; 95% CI 0.80-0.99). These patterns did not apply uniformly across all PLF types. For example, honey was more common among home births than deliveries at health facilities, but formula and other milk were more common among caesarean deliveries. Mapping risk factors for PLF, especially by types, could help to design more targeted interventions to reduce PLF and improve breastfeeding practices in Indonesia.

Data from the UK Infant Feeding Surveys indicate that breastfeeding initiation increased between 1985 and 2010. During this period, societal changes in GB also influenced the sociodemographic characteristics of women in the childbearing population. As breastfeeding behaviour is highly socially patterned in GB, the increasing trend in breastfeeding initiation may have hidden inequalities in breastfeeding practices. This study examines the sociodemographic inequalities in breastfeeding initiation in GB between 1985 and 2010, exploring whether and how this may have been influenced by social and policy changes. Data drawn from the nationally representative 1985, 1990, 1995, 2000, 2005 and 2010 Infant Feeding Surveys were used to estimate changes in the proportion of mothers in selected sociodemographic groups over time. Logistic regression models estimated the independent associations between breastfeeding initiation in each survey year and maternal sociodemographic characteristics. Associations were adjusted for maternal sociodemographic, pregnancy-related and support factors. Evidence of a change in the association between breastfeeding initiation and each sociodemographic characteristic over time was assessed using a test for statistical heterogeneity. The sociodemographic characteristics of mothers in GB changed substantially between 1985 and 2010. Mothers were increasingly more likely to be 30 or over; have higher education and socioeconomic status; and be single or cohabiting. An increasing proportion of mothers in GB identified as being of black or minority ethnic origin. Reported smoking in pregnancy declined. These same characteristics independently predicted higher odds of breastfeeding initiation; the associations between these characteristics and breastfeeding initiation did not vary significantly over time. Marked inequalities in breastfeeding initiation persisted over the study period, hidden among the increasing initiation rate at the population level. The increasing overall rate of initiation was most likely driven by the rising prevalence of those groups of mothers who were, and remain, characteristically most likely to breastfeed.

Fathers are increasingly involved in care of their babies and young children. We assessed the association of resident fathers' involvement with subsequent behaviour of their children, examining boys and girls separately. We used longitudinal data from the UK Millennium Cohort Study for children born in 2000-2001, divided into three separate analysis periods: ages 9 months to 3 years, 3 to 5 years, and 5 to 7 years. By exploratory factor analysis of self-reported attitudes and engagement in caring activities, we derived composite measures of various types of father involvement at 9 months, 3 and 5 years. Where possible we created equivalent measures of mother involvement. Child behaviour was assessed by the Strengths and Difficulties Questionnaire (SDQ), which was completed by the mother when the child was aged 3, 5 and 7 years. We estimated gender-specific odds ratios for behaviour problems per quintile of father involvement, using separate logistic regression models for boys and girls in each analysis period. We controlled for a wide range of potential confounders: characteristics of the child (temperament and development at 9 months, and illness and exact age at outcome), equivalent mother involvement where appropriate, and factors related to socioeconomic status, household change, and parental well-being, where statistically significant. Paternal positive parenting beliefs at age 9 months and increased frequency of creative play at age 5 years were significantly associated with lower risk of subsequent behaviour problems (SDQ total difficulties) in both boys and girls (p<0.05), odds ratios ranging between 0.81 and 0.89 per quintile of involvement. No associations were observed for other composite measures of caring activity by the father at 9 months, 3 years or 5 years. Quality of parenting, rather than the division of routine care between parents, was associated with child behavioural outcomes.

Background Optimising women's pre-pregnancy health is a policy priority for benefits spanning pregnancy and throughout the mother and baby's life. In the UK pre-pregnancy care (PPC) tends to be delivered in primary care, with the onus on women to seek services. We aimed to describe women’s engagement with General Practice (GP) in the year preceding pregnancy, including specific PPC; to explore whether women with recognised risk factors for poor pregnancy outcomes receive targeted care. Methods Data for women aged 18-48yrs and registered for ≥ 12 months with a GP on 01/01/2017, were drawn from English Clinical Practice Research Datalink (CPRD) GOLD, a source of electronic health record data. Demographic characteristics, lifestyle factors and health conditions were described. CPRD Pregnancy Register and linked hospital data were used to identify pregnancies in 2017/18 and to describe PPC in the year preceding pregnancy. Results Of 193,578 women included, 14,326 had a confirmed pregnancy. 7.6% of the pregnant women had records indicating specific PPC in the preceding year, whilst 41.0% had records of health promotion (advice on nutrition, smoking, weight, alcohol and contraception). More women with pre-existing medical conditions received health promotion (46.0%-83.9% for various risk groups), although the levels of PPC remained low (4.7%-14.9%). Conclusions PPC was rarely recorded, likely reflecting low levels of consultation for, or discussion of, pregnancy planning. This represents a missed opportunity for maximising women’s health, particularly in those with recognised risk factors for poor pregnancy, perinatal and longer-term outcomes.