A panel of top experts in perinatal psychiatry reviews the many recent studies on the use of psychiatric medications in pregnancy and postpartum and assesses their impact on the diagnosis and treatment of pregnant/postpartum women. The authors focus on each of the major psychiatric illnesses, including depression, anxiety disorder, bipolar disorder, schizophrenia, substance abuse, eating disorders, and mental illness, as well as on the potential impact of these illnesses on infants and children. Interpreting conflicting and inconclusive clinical findings, they spell out the lesser-known risks of prenatal medication exposure and illuminate a variety of issues that must be taken into account in choosing such treatments as medications, psychotherapy, parental education, and social skills training.