Prenatal and postnatal depressive symptoms are common in expectant and new mothers and fathers. This study examined the association between four patterns of probable perinatal depression (mother depressed, father depressed, both depressed, neither depressed) in co-parenting mothers and fathers and their children’s internalizing and externalizing behaviours at 24 and 36 months of age. | Maternal and paternal perinatal depressive symptoms associate with 2- and 3-year-old children’s behaviour: Findings from the APrON longitudinal study