Pregnant Mothers with Opioid Use Disorder for Drug Addiction

The goal of this observational study is to learn about the long term effects of prenatal opioid exposure. The main objectives are: * Long term goal: to improve the safety and efficacy of maternal Opioid Use Disorder (OUD) and eliminate neonatal opioid withdrawal syndrome (NOWS) and poor childhood neurodevelopment. * To characterize prenatal opioid exposure (POE) related placental and fetal brain structural and functional disruptions using longitudinal placenta-fetal brain magnetic resonance imaging (MRI) and determine proteomic, genomic, and epigenetic signatures of NOWS and poor infant neurodevelopment. In this study participants will: * Receive two placental-fetal MRIs, one during second trimester and one in third trimester. * Answer surveys relating to their medical and social history. * Have blood drawn during pregnancy and delivery. * Child development follow up: answer surveys on their child's development milestones and at one year of life they will undergo a development assessment.