Breasts that do not eat milk while breastfeeding may cause milk stagnation, less milk, and a change in breast size. 1. Milk stagnation: Breasts eating milk while not eating may lead to milk stagnation in the breast that doesn’t eat milk, and when the milk in one breast keeps piling up, it may lead to breast enlargement, and the milk ducts will be clogged with redness, swelling and hot pain, and mastitis will occur. 2. The milk becomes less: the breastfeeding let the baby suck more milk, can promote the body lactation hormone secretion increase, the milk discharge increased, one side of the breast sucks less often, the amount of milk will gradually become less. 3. Breast size change: Breasts are not eaten on one side of the breast, may lead to a significant difference in the size of the two sides of the breasts, not breastfeeding breasts gradually back to the milk, become smaller or shrinkage. Breasts while breastfeeding does not eat may cause mastitis and other problems, to learn the correct method of breastfeeding, each time you breastfeeding to empty the two sides of the milk, the baby does not sucking can be used to suck the breast milk out of the breast pump, try to reduce the above these adverse effects; the physical discomfort, you should promptly consult the doctor, and active treatment, so as not to delay the condition.