When a woman enters pregnancy and breastfeeding, her breasts increase in size due to hormone levels and the opening of the milk ducts in preparation for breastfeeding, until the end of the breastfeeding period, when estrogen levels gradually decrease and the breasts return to their pre-pregnancy state, but are usually no smaller than before pregnancy. Female breasts begin to increase in size during puberty and reach a peak during childbearing years. During pregnancy, the breasts increase again due to increased estrogen levels and remain enlarged until the end of the breastfeeding period. However, if a woman enters old age, her breasts will become smaller to a corresponding degree, which is a normal physiological change process, and there is no need to worry too much. Some women will feel that their breasts are smaller after childbirth than when they did not have children, because the size of the breasts gradually returns to normal after breastfeeding, when the skin is loose, there may be sagging of the breasts, etc., by the visual and psychological impact, the mother feels that the breasts are smaller than before, but this is not the case. Women with sagging breasts do not need to worry too much, it is a normal phenomenon and should be treated correctly. Women can wear suitable underwear to hold up their breasts to avoid sagging due to gravity, and to strengthen the movement of the breasts to stimulate the development of the pectoralis major muscle. If you are not satisfied, you can go to the hospital for consultation according to your personal wishes and undergo the appropriate treatment under the doctor’s advice.