Purpose. The Quebec Longitudinal Study of Child Development (QLSCD) was designed to examine the long-term associations of preschool physical, cognitive, social, and emotional development with biopsychosocial development across childhood, adolescence, and young adulthood.Methods. QLSCD is an ongoing prospective cohort including 2120 singletons born in 1997/1998 in the Canadian province of Quebec. So far, data has been collected annually or every two years from child ages 5 months to 21 years. The cohort currently includes 1245 participants. Data available include a range of environmental (e.g., family characteristics, child behaviour, educational attainment, mental health), biological (e.g., hair cortisol, genetic, epigenetic), and administrative data.Results. QLSCD has contributed to the understanding of children's psychosocial development, including the development of physical aggression and anxiety. QLSCD articles have advanced scientific knowledge on the influence of early childhood factors on childhood, adolescent, and young adult mental health, including the effect of participation in early childcare on cognitive and behavioural development, the developmental origins of adolescent and young adult mental health problems and suicide risk, and the development of interpersonal difficulties (e.g., peer victimisation) from preschool years to adolescence. Conclusion.QLSCD has given major contributions to our understanding of the link between different aspects of child development and biopsychosocial development during the first two decades of life. Unique features include the presence of environmental, biological, and administrative data, long-term follow-up with frequent data collections, and use of data from multiple informants, including teachers, mothers, fathers, and the children themselves.

Little is known about the COVID-19 pandemic-related disruptions in health services and the resilience of the health system response in rural low-resource settings. We conducted a phenomenological qualitative study (October-November 2020) to understand COVID-19-related influences on the utilisation and delivery of child health services in Monapo district, rural Mozambique. We interviewed 36 caregivers with children <2.5 years, 21 health providers, and 4 district health services staff using in-person in-depth interviews. Data were analysed using inductive thematic content analysis. Our findings showed that caregivers, providers, and district health services staff unanimously reported a decrease in child consultations at the start of the pandemic. Administrative data from health facilities confirmed persisting declines in monthly consultations. Respondents explained reductions due to miscommunication about health facility operations, fear of COVID-19, reduced consultation schedules, and reduced household incomes. Providers reported several challenges in delivering services including lack of caregiver compliance with risk mitigation measures, caregivers’ fear of risk mitigation measures, perceived lack of caregiver knowledge about COVID-19, and lack of supplies and protective equipment. All respondents described how COVID-19 had increased food insecurity and food prices, and reduced incomes and livelihoods. These negative economic consequences were perceived as the main reason for reported increases in cases of child malnutrition. Despite reductions, child health service utilisation and delivery has largely continued throughout the COVID-19 pandemic, indicating an adaptive and resilient primary health system response in Monapo district. Our findings highlighted the persistent difficulties providers and caregivers face adhering to COVID-19 prevention and risk mitigation measures. A coordinated multi-sectoral response is needed to address the persistent negative economic impacts of the pandemic for young children and their families in rural areas.

Maternal depression symptoms (MDS) are a robust risk factor for internalising problems (IP) in the offspring. However, the relative importance of MDS and other factors associated with it (i.e. other types of maternal psychopathology, maternal parenting practices, family characteristics) is not well understood. To (a) identify a group of children with high levels of IP between 6 and 12 years using combined maternal and teacher assessments and (b) to quantify the associations between trajectories of MDS during early childhood and children's IP trajectories before and after controlling for family factors associated with MDS. MDS and family factors were assessed in a population-based sample in Canada (n = 1537) between 5 months and 5 years. The outcome variable was membership in trajectories of teacher- and mother-rated IP between ages 6 and 12 years. Family factors were included as covariates in a multinomial logistic regression model. There was a strong association between MDS and children's atypically high levels of IP in unadjusted analyses [OR 4.14 (95% CI 2.60; 6.61)]. The association was reduced, but remained strong [2.60 (1.55; 4.36)] when maternal psychopathology, maternal parenting, and family socioeconomic status were entered in the model. MDS, maternal anxiety, and low parental self-efficacy were associated with offspring's high IP trajectories. MDS is associated with high levels of children's IP independently of other maternal and family characteristics. Intervention targeting maternal psychopathology and parenting self-efficacy and testing the impact on children's IP would provide information on the putative causal pathways between maternal and offspring's symptomatology.

Exposure to chronic MDS in early childhood is associated with lower levels of verbal abilities in middle childhood. Further research is needed in larger community samples to test the association between MDS and children's long-term language skills.