After pregnancy, women are affected by the hormone level in the body, the mammary gland starts to develop for the second time until the end of the breastfeeding period when the stimulation of mammary hormones and sucking disappears and the gland gradually returns to the normal level, which is the normal change of the mammary gland during the breastfeeding period, and the mammary gland flattens after stopping breastfeeding. It is not recommended to use drugs or go to private clubs for massage treatment. The direct and effective way to enlarge breasts is through surgery, and it is recommended to choose autologous fat transplantation or prosthesis implantation after breastfeeding period is over. Normally, pay attention to a reasonable nutritious diet and appropriate amount of upper limb and chest strength exercise can play a certain role in shaping.