Paternal involvement in infant care and developmental milestone outcomes at age 3 years: the Japan Environment and Children's Study (JECS).

Using Japan's largest birth cohort data (Japan Environment and Children's Study), we showed that paternal involvement in infant care might benefit young children's development. Fathers' active involvement in infant care was associated with a lower risk of developmental delays in gross-motor, fine-motor, problem solving, and personal-social domains. Maternal parenting stress may mediate the association between paternal involvement in infant care and child development outcomes at 3 years.