After treatment, the swollen milk can usually disappear in 2-3 days, but if not treated in time, there may be a continuous increase in milk. Breast swelling, also known as milk increase, usually occurs 3-5 days after delivery, and breastfeeding mothers feel breast enlargement, heaviness, heat and discomfort, which is caused by the large amount of milk secretion, expansion of breast blood vessels and increase of blood and tissue fluid. Therefore, when feeding a child during breastfeeding, it is important to develop good breastfeeding habits and let the baby suck one side of the breast empty before sucking the other side to prevent milk stagnation, alternating between the two sides of the breast. When children suck milk, they should have full contact with the mother’s breast, let the child suck the nipple and most of the areola, develop good sucking habits, and feeding habits are the main measures to prevent breast rises. Avoid strenuous exercise during the period of milk increase. If the distension is severe, you can squeeze out the milk to relieve the pain and pay attention to breast hygiene to prevent the occurrence of acute mastitis. You can also use a breast pump to help drain the excess milk from the breast tissue to prevent milk stagnation from occurring.