Adverse babyhood experiences (ABEs) identify 10 categories of negative events for mothers before they conceive, and for parents and babies from conception until a child’s third birthday. ABEs identify preventable and reducible non-genetic factors that increase risk for infant morbidity and mortality, chronic illness, mental health conditions, and other symptoms in a child’s life; morbidity and mortality in mothers; PTSD and depression in fathers, and more. Understanding, repairing, and reversing effects of ABEs decreases risk for adverse childhood experiences (ACEs), and for poor health outcomes in parents and children.