Breastfeeding women appear milk rise, mainly due to the following circumstances: the first, is a physiological milk rise period, this generally occurs in the 2-3 days after delivery. When the fetus is delivered, the hormone level in the body of the mother will change, in the prolactin and contraction of the dual role of the hormone, generally in this time will appear in the process of filling the milk ducts, this physiological milk rise, generally last about 24 hours will disappear naturally. The second situation, is to consider and not on time feeding has a relationship, milk is constantly secreted, if more than 3-4 hours without breastfeeding, milk will be stagnant, which will cause the situation of milk rise. The third situation, if the milk ducts are blocked, the milk ducts are not open, which will also cause the milk to rise. In the fourth case, blindly taking some drugs to promote breast milk will also cause milk swelling. In short, the best way to promote milk secretion and to keep the milk flowing is to let the baby keep sucking.