The first session of this four-part series will include an overview of substance use in pregnancy and the impact on fetal and infant development.The goal of the first session is to provide background information on substance use disorders and mental health conditions in women of child-bearing age and how these conditions may impact the woman and her fetus during pregnancy. Substances to be discussed include opioids, illicit substances, nicotine, and psychotropic medications. The session will also introduce the impact of substance exposure on the fetus and newborn.