Breasts are very soft, very loose and weak body, excessive weight loss, after breastfeeding, age related, breasts are getting softer and softer, consider with the quality of the body has a direct relationship. First of all, the usual exercise time is less, intake of nutrition is less when the body lacks nutrition, resulting in loose and sagging breasts performance. Secondly, excessive weight loss can lead to loose and sagging breasts. Breasts are formed by a combination of fat and mammary glands, and fat can play a role in supporting the breasts. As a result of excessive weight loss, the fat in the body and breasts will gradually decrease, leading to loose and sagging breasts. After pregnancy, the hormone level increases, the breast follicles and breast lobules gradually proliferate, and the breasts will also increase in size. At the end of the breastfeeding period, the hormone level retreats, and the breasts lack the support of milk, which will be manifested as loose and sagging. With age, the body’s collagen gradually loses, and the breasts lack support, and the performance of loose and sagging will also occur.