BioPsychoSocial Development Laboratory

Depression and ADHD frequently co-occur, presenting unique challenges such as difficulties in executive functioning and reduced quality of life. Both conditions are also associated with less optimal parenting behaviors. Despite the prevalence of this comorbidity, the combined effects of maternal depressive symptoms and ADHD on child development remain underexplored, particularly in early childhood, a critical period marked by heightened brain plasticity and reliance on external regulation. This study examines how maternal depression and ADHD symptoms jointly predict children’s emotional and attentional development across the first two years of life. A sample of 156 mothers and children (51% boys) participated in a three-wave longitudinal study from pregnancy to two years postpartum. Maternal ADHD symptoms were reported during pregnancy, while depressive symptoms were reported at pregnancy, three months, and two years postpartum. At two years of age, child depressive symptoms were reported by mothers, and focused attention was observed during a structured play session. Findings revealed that the combination of high maternal ADHD and depressive symptoms in the perinatal period predicted the most significant difficulties in children at two years of age, including elevated depressive symptoms and reduced focused attention. Specifically, maternal depressive symptoms were associated with greater child depressive symptoms and lower focused attention only when maternal ADHD symptoms were elevated. These results highlight the compounding effects of maternal psychopathology on child development, emphasizing the importance of targeted support for children at heightened risk of emotional and cognitive impairments due to parental psychopathology.