Breasts may also sag if you don’t breastfeed. After pregnancy, the placenta will secrete a large amount of estrogen to stimulate the development of mammary gland ducts and a large amount of progesterone to stimulate the development of mammary gland follicles, which will significantly increase the size of the breasts during pregnancy. At the same time, due to the effect of gravity, the enlarged breast will pull the skin and suspensory ligaments, postpartum due to the decline in hormones, when not breastfeeding the volume of the breast will be reduced, but the elongated skin and ligaments there is no way to immediately recover. Women can have breast massage after delivery to stimulate local blood flow, and they can also do appropriate physical exercise, such as chest expansion exercises, to promote breast recovery. Women can also wear suitable bras to reduce breast sagging. Breastfeeding is good for the growth and development of babies, and women do not have to refuse breastfeeding because of concerns about the outside.