RIPPLE employs a mixed-method approach, combining self-reports, interviews, and observational measures with physiological and hormonal data. Our longitudinal study follows families from pregnancy through early childhood, examining key factors such as emotion regulation, mentalizing, and attachment. We explore the interdependence among family members, considering both individual experiences and family interactions. The project utilizes both established procedures and experimental measures developed in our lab. By examining emotional, relational, and behavioral mechanisms over time, we aim to understand how couples navigate the transition to parenthood. Our findings have implications for supporting new families and promoting healthy child development.