The transition to parenting (Galinsky, 1987) can be a tumultuous time, particularly when parents have experienced traumatic and stressful life circumstances. Interventions to help these parents often focus on the first 2 years after birth because of the importance of this sensitive period for babies' developing brains. However, we describe research showing that babies' experiences in the womb matter just as much as the experience after birth. We give examples of interventions to support expecting parents by addressing prenatal stress and trauma. These types of intervention can help in the transition to parenting and promote positive development for both parents and their future children.