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Postnatal depression (PND) is associated with adverse effects on a broad range of child outcomes, including language problems. The current study aimed to investigate if the time of exposure to maternal PND symptoms measured with the Edinburgh Postnatal Depression Scale (EPDS) at 6 weeks, 4 months and 6 months postpartum were related to the infants’ communication skills measured with the Ages and Stages Questionnaires (ASQ) at 12 and 24 months. Secondly, to study to what extent the number of exposures to high level of PND symptoms (i.e., EPDS score ≥ 10) might be associated with level of communication skills later (at 12 and 24 months), and last, to determine to what extent maternal PND symptoms at 6 weeks were related to changes in the developmental course of communication skills from 4 to 24 months. 1555 children and their mothers participate in the study. Regression analyses indicated …