Objective. Early childhood exposure to violent media content represents an actionable target for preventive intervention. The associated risks for later aggressive behavior have been established in childhood, but few studies have explored widespread long-term associations with antisocial behavior. We investigate prospective associations between exposure to violent television content in early childhood and subsequent antisocial behavior in mid-adolescence. Method. Participants are 963 girls and 982 boys from the Quebec Longitudinal Study of Child Development (QLSCD) birth cohort. Parents reported the frequency of their child’s exposure to violent television content at ages 3.5 and 4.5 years. Four indicators of antisocial behavior were self-reported by participants at age 15 years. These indicators were linearly regressed on exposure to violent television content at ages 3.5 and 4.5 years. All analyses, stratified by sex, controlled for pre-existing and concurrent potential individual and family confounding variables. Results. For boys, preschool violent televiewing was associated with increases in proactive aggression (β = 0.065; 95% CI, 0.001 to 0.089), physical aggression (β = 0.074; 95% CI, 0.040 to 0.487), and antisocial behavior (β = 0.076; 95% CI, 0.013 to 0.140) by mid-adolescence. No prospective associations were found for girls. Conclusions. This study of typically developing children demonstrates long-term perils associated with early exposure to violent content in childhood. We observed risks for aggressive and delinquent behavior in boys, more than a decade later. Preventive intervention campaigns that target knowledge transfer to parents and communities regarding the potential insidious consequences of preschool exposure promise more optimal development in youth.

Background/objectives: Early childhood is marked by rapid physical and cognitive development, underscoring the critical influence of parental choices in shaping habits, pastimes, and traditions. The World Health Organization highlights habits of physical activity, sleep, and screen use as modulators of healthy development and well-being in young children. As a first, this birth cohort study investigates the relationship between movement behaviors in toddlerhood and subsequent sport participation during middle childhood. Methods: Participants are 930 boys and 926 girls from the Quebec Longitudinal Study of Child Development. Using a population-based analytical approach, we examined the relationship between parent-reported active leisure, sleep, and sedentary screen time at age 2 years and trajectory of sport participation between ages 6 and 10 years using sex-stratified linear regressions that account for a range of pre-existing individual and family confounding factors. Results: Many child and family characteristics predicted early childhood movement behaviors, distinctly for boys and girls. Moreover, parental regulation of screen time during early childhood significantly influenced their decisions to enroll and encourage sport participation in sons during school age. Specifically, boys who spent more than 1 h/day on screens had 10% fewer chances of consistently participating in sport throughout middle childhood, even after accounting for adherence to other lifestyle habits. Conclusions: Our findings suggest that parental values regarding early childhood screen exposure are an effective potential target for intervention fostering healthy and active development. Future research should focus on parent and child motivations for sport involvement in the long-term.

Background/Objectives: Physical activity is an important protective factor throughout life. However, little research has observed the associations between the practice of physical activity and academic success longitudinally, and none have done so with a pan-Canadian sample. This article aims to examine the prospective associations between active leisure in middle childhood and academic achievement in emerging adulthood, for both boys and girls, beyond several family factors. Methods: Participants are 2775 children from the National Longitudinal Study on Children and Youth (NLSCY) aged between 12 and 20 years. Active leisure was self-reported by children at age 12 years regarding their weekly organized sport, artistic sport, and unstructured physical activity participation outside of school hours. Academic success was measured by self-reported school average at age 18 years and the obtention of high school diploma at age 20 years. Results: Girls who engaged in more organized or artistic sports at age 12 years had better academic results at age 18 years (respectively β = −0.082, p < 0.01; β = −0.228, p < 0.001). Both boys and girls who partook in more organized sports at age 12 years were more likely to graduate from high school by age 20 years (respectively β = −0.146, p < 0.001; β = −0.071, p < 0.05). However, girls who engaged in more unstructured physical activity at age 12 years had lower academic achievement at age 18 years (β = 0.077, p < 0.001). Conclusions: Policy makers should aim to reduce the many barriers to an active lifestyle in childhood. Parents should be encouraged to lead their children to go play outside with friends to allow them to fully reap the benefits of an active lifestyle from a young age.

Cross-sectional research suggests associations between enrichment and cognitive skills in toddlerhood. There are no prospectively designed longitudinal studies that investigate the link between early home literacy activities and subsequent mechanisms that explain the putative cognitive benefits. This study tests long-term associations between toddler literacy enrichment and later student engagement across key academic transitions, from kindergarten to the end of high school. Using the Quebec Longitudinal Study of Child Development (QLSCD) population-based birth cohort data, we examined whether parent-reported experiences of shared reading, looking at picture books or illustrated stories, and pretend writing at age 2 years predict later teacher- and self-reported student engagement at ages 6, 12, and 17 years. The results from multiple regression models, stratified by sex and adjusted for pre-existing and concurrent child and family characteristics, revealed significant associations between early literacy enrichment and later engagement. For boys and girls, literacy enrichment in toddlerhood predicted increases in classroom engagement from kindergarten to the end of high school. These findings highlight the lasting influence of early literacy exposure on subsequent learning-related behaviors, both in and beyond the classroom. They underscore the importance of promoting enrichment in early childhood as a family strategy toward individual readiness to learn, a cornerstone of crystalized intelligence.

Maternal health represents an important predictor of child development; yet it often goes unnoticed during pediatric visits. Previous work suggests that mental state affects parenting. The relationship between infant exposure to maternal depressive symptoms suggests conflicting findings on physical growth. Body mass index (BMI) has not been rigorously examined across development. Using a prospective-longitudinal birth cohort of 2120 infants (50.7% boys), we estimated the prospective relationship between symptoms of maternal depressive symptoms at 5 months postpartum and later BMI in typically developing children. We hypothesized that maternal depressive symptom severity would predict later BMI through to adolescence. Mothers self-reported depressive symptoms at 5 months. Child BMI was measured by a trained research assistant at ages 6, 8, 10, 13, and 15 years. We estimated a series of sex-stratified regressions in which BMI was linearly regressed on maternal symptoms, while controlling for potential pre-existing/concurrent individual and family confounding factors. Boys born to mothers with more severe depressive symptoms at age 5 months had a significantly lower BMI than other boys at subsequent ages. There were no such associations observed for girls. Maternal depressive symptoms were prospectively associated with later BMI for sons and not daughters, predicting risk of faltering in growth through to adolescence. Health practitioners should routinely assess maternal psychological functioning during pediatric visits to optimize parent and child flourishment.

Sharing a meal together offers an innovative approach to study the family environment. How often families eat together may not capture the distinct experience for sons and daughters. Instead, studying family meal characteristics might be more enlightening. This study aims to examine the prospective associations between family meal environment quality at age 6 years and later well-being at age 12 years in 734 boys and 758 girls. Participants are from the Quebec Longitudinal Study of Child Development birth cohort. When children were aged 6 years, parents reported on their family meal environment experience. At age 12 years, child outcomes included parent-reported healthy lifestyle habits, teacher-reported academic achievement, and self-reported social adjustment. The relationship between early family meal environment quality and later child outcomes were analyzed using multivariate linear regressions. For girls, better family meal environment quality at age 6 years predicted an earlier bedtime, a lower consumption of soft drinks and sweet snacks, more classroom engagement, and fewer behavior problems at age 12 years. For boys, better family meal environment quality at age 6 years predicted an earlier bedtime and less anxiety and more prosocial behaviour at age 12 years. These significant relationships were adjusted for a multitude of child/family characteristics. From a population-health perspective, our findings suggest that family meals represent a cost-efficient, effective protective factor that likely has long-term influences on bio-psycho-social development. Information campaigns that promote family meals as a health intervention could optimize the well-being of boys and girls.