Some newborn baby girls suddenly have bleeding discharge from the vagina 5-7 days or 1-2 weeks after birth, and their diapers are red and stained, which often causes panic among parents, but in fact, this is a normal physiological phenomenon, medically known as pseudomenstruation. Pseudomenstruation is one of several special physiological states common in the newborn period, due to the sudden interruption of maternal estrogen after the birth of the baby, which generally does not require treatment and can stop on its own after 1-3 days. Parents need to wash the vulva with warm water to maintain hygiene and prevent infection.