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Introduction: The report examined reciprocal within-person associations among maternal depressive symptoms and offspring depressive, anxiety and irritability symptoms from early childhood to adolescence using a random intercept cross-lagged panel model (RI-CLPM)., Method: Participants were 609 mother-child dyads participating in the Stony Brook Temperament Study. Child and maternal internalizing symptoms were assessed every 3 years from ages 3 to 15 using maternal report on the Child Behavior Checklist (CBCL) and Diagnostic Inventory for Depression, respectively., Results: At the between-person level, maternal depressive symptoms, and child depressive, anxiety, and irritability symptoms were all positively associated with one another. At the within-person level, greater within-person child anxiety symptoms at age 3 predicted both greater child anxiety and depressive symptoms at age 15 via greater child anxiety from ages 6 to 12, and greater within-person child irritability at age 3 predicted greater maternal depressive symptoms at age 15 via greater child irritability from ages 6 to 12., Conclusions: Findings reveal novel within-person developmental pathways from early childhood internalizing problems to later internalizing problems in both the child and mother. Intervention and prevention efforts should thus focus on early identification and prevention of childhood internalizing symptoms to reduce negative effects on both child and parent symptoms.