We found that public health nurses can have an important role in supporting mothers' mental health postpartum. Although caution is warranted in interpreting our results, the findings concur with those of other studies, highlighting that an equal care emphasis on both the mother and child can be an important aspect of successful support. Implementing person-centred care might be one strategy to create such an emphasis, while also promoting the mental health of new mothers. Public health nurses have a unique opportunity to support mothers' transition into healthy motherhood, especially because they are likely to meet both mothers and children on a regular basis during the first year after birth.