I am interested in mental well-being, especially in the pre- and postnatal period. Previous research has shown that perinatal mental well-being has an influence on the development of the child. Therefore, it is particularly important for pregnant women to feel good. That is why, in my PhD, I will investigate the effectiveness of professional mental support in the perinatal care. More specifically, I will try to shape the function of the perinatal mental health professional together with parents (to be) and professionals within the existing perinatal care. Thereafter, I will investigate the effects of the implementation of such additional professional mental care on the mental well-being of the mothers (to be).