This study replicated and extended Narayan and colleagues’ (2018) original benevolent childhood experiences (BCEs) study. We examined associations between adverse and positive childhood experiences and mental health problems in a second sample of low-income, ethnically diverse pregnant individuals (replication). We also examined effects of childhood experiences on perinatal mental health problems while accounting for contemporaneous support and stress (extension). Participants were 175 pregnant individuals (M = 28.07 years, SD = 5.68, range = 18–40; 38.9% White, 25.7% Latina, 16.6% Black, 12.0% biracial/multiracial, 6.8% other) who completed standardized instruments on BCEs, childhood maltreatment and exposure to family dysfunction, sociodemographic stress, and perinatal depression and post-traumatic stress disorder (PTSD) symptoms. They completed the Five-Minute Speech Sample at pregnancy and postpartum to assess social support from the other biological parent. Higher family dysfunction predicted higher prenatal depression symptoms, while higher BCEs and prenatal social support predicted lower prenatal PTSD symptoms. Prenatal depression and prenatal PTSD symptoms were the most robust predictors of postnatal depression and PTSD symptoms, respectively, although higher postnatal social support also predicted lower postnatal PTSD symptoms. Findings replicated many patterns found in the original BCEs study and indicated that contemporaneous experiences are also associated with perinatal mental health problems.