The main causes of acute mastitis in new mothers are: 1. New mothers have delicate nipples, babies sucking and chewing on the nipple rupture, pathogenic bacteria invade and lead to cross infection. 2. 2, too much milk, more milk, sucking is not clean, the milk is not timely emptied to the milk stasis, the formation of breast lumps. Redness, swelling, heat and pain in the breasts. Prevention and treatment: Drink a lot of water, eat more nutritious food rich in many kinds of vitamins and trace elements, keep in a good mood, have enough sleep, and make sure that the bowels are smooth. To master the correct breastfeeding posture, each time breastfeeding the two sides of the breast to take turns to suck empty. If the breast is full, empty the remaining milk. If you suck hard enough, the more you suck, the more milk you will get, and keep your nipples clean. Lactational mastitis should be treated as soon as possible, and regular massage techniques should be used to expel the stagnant milk. Don’t listen to the so-called “lactation consultant”, irregular massage will lead to excessive squeezing, high fever and aggravation of the condition, you should go to the regular hospital for treatment.