The study investigates the effectiveness of the mindfulness-based intervention Mindful with your Baby in women with babies between 5-9 months postpartum who experience heightened levels of postpartum depression, anxiety and/or parental stress. The intervention Mindful with your Baby is one of the very few interventions for maternal postnatal mental health issues that takes the bond between mother and infant into account. It is hypothesized that the Mindful with your Baby intervention will reduce levels of postpartum depression, anxiety and parental stress, and improve mother-infant behavioral interaction and increase neural synchrony between mother and infant brains.