Investigating both maternal psychopathology and maternal health behaviors is imperative to our understanding of perinatal health. While the existing literature documents the marked effect of perinatal depression on maternal psychopathology in the postpartum period, perinatal anxiety, specifically perinatal PTSD, has received less attention. Thus, the current study aims to investigate the maternal health behaviors in the prenatal period that are predictive of postpartum PTSD and depressive symptoms. 272 women were recruited from the Mother and Baby unit at the University of Iowa Hospitals and Clinics. Participants completed questionnaires one week following delivery and three months postpartum, which measured a number of prenatal health behaviors and assessed for depression and PTSD symptoms. Analyses included bivariate correlations and simultaneous linear regressions, in order to determine the extent to which health behaviors predict postpartum depression and PTSD. These analyses revealed that predictors of postpartum depression include the total number of stressful life events, and whether or not the mother had a discussion with healthcare providers on the effects of drugs or alcohol during pregnancy. Predictors of postpartum PTSD include the total number of pregnancy complications, the total number of stressful life events, and whether or not the mother had a discussion with healthcare providers on the effects of drugs or alcohol during pregnancy. These findings may lead to future studies aimed at determining whether these predictors have a causal effect on postpartum psychopathology, and may also provide insight into potential interventions to reduce postpartum depressive and PTSD symptoms.