Breasts don’t usually dry out without breastfeeding, but they may sag. The drying up of female breasts is related to age. It is mainly caused by collagen loss and skin aging, and most of the maternal breasts will be enlarged because of the secretion of milk, when not breastfeeding the amount of milk secretion will be reduced, the breasts will be smaller, but generally does not cause collagen loss and skin aging, will not be shriveled phenomenon, may be maintained in the original state, or sagging phenomenon. Mothers should pay attention to postnatal breast care. When not breastfeeding, they can use their hands or breast pumps to squeeze out the excess milk to avoid milk distention; if there is serious sagging of the breasts, suspension surgery will be used to correct the breasts. Mothers who have abnormal breast changes should go to a regular hospital in time to identify the causes and standardize the treatment under the guidance of the doctor.