Postpartum blues—commonly known as the "baby blues"—is a widespread, temporary condition that affects up to 85% of new mothers, bringing on mood swings, irritability, and unexplained tearfulness that typically begin a few days after delivery and resolve within two weeks. While the exact cause is unclear, it's linked to the sudden drop in hormones like estrogen and progesterone after the placenta is delivered, compounded by sleep deprivation and the stress of caring for a newborn. A personal or family history of depression is the strongest risk factor, and experiencing postpartum blues increases the likelihood of developing more severe postpartum depression afterward. Treatment is primarily supportive, focusing on adequate rest and emotional reassurance, but if symptoms persist beyond two weeks or disrupt daily functioning, it's crucial to seek evaluation for conditions like postpartum depression or anxiety. Although prevention isn't fully understood, education and reassurance are key to helping new parents navigate this challenging but common phase.