The project we propose aims to follow individual well-being and health over the early stage of life and trace out their consequences on future outcomes. Considering parents and family health and socioeconomic background at birth and genetics as the starting conditions of a dynamic system, we take a life course perspective and analyze the mechanisms through which the socioeconomic dimension can influence the pathways of child development. Our approach considers the psychological well-being as a socioeconomic-related mediating factor that exerts its influence since the early stages of one’s life, in turn affecting the development pathways.