This document discusses three postpartum psychiatric disorders: postpartum blues, postpartum depression, and postpartum psychosis. Postpartum blues occurs within the first few weeks after delivery and involves mood lability and irritability but does not impair function. Postpartum depression occurs within the first three months and includes depressed mood and feelings of worthlessness that do impair function. Postpartum psychosis has an onset within 72 hours of delivery and is characterized by rapidly shifting mood, delusions, and hallucinations that can instruct harm, severely impairing function. Risk factors include hormonal changes, life stressors, previous psychiatric episodes, depression during pregnancy, and history of mood disorders.