On today's Please Explain, we'll look into the causes and symptoms of postpartum depression, and the field of perinatal psychiatry, the evaluation and treatment of psychiatric disorders associated with female reproductive function. We're joined by Dr. Catherine Monk, Irving Assistant Professor of Clinical Psychology, Columbia University Medical Center, and Dr. Shari Lusskin, Director of Reproductive Psychiatry, at NYU Langone Medical Center and Mt. Sinai Medical Center.