Breast swelling during breastfeeding is a common problem, and there are many postpartum rehabilitation facilities in the community that make breast swelling appear septic. The first time when the most milk swelling occurs is the first five days, especially the first three days. The first three days of milk swelling is usually not because of a lot of milk, but because the blood vessels and lymphatic vessels are extremely full and swollen. Some women who have had a normal delivery are discharged from the hospital the next day, and they are at home during the three-day swelling period. The patient asks an outside doula to treat the swelling, and the doula uses improper force, which leads to septicemia of the breast tissue. The first way to deal with milk swelling is to suckle the baby, the baby’s sucking is better than any lactationist, only through frequent sucking, lactogen will be secreted better and will solve the problem.