During pregnancy, the estrogen and progesterone in the body will increase, and it is a normal physiological reaction that the breast will increase under the effect of estrogen and progesterone; after the birth of a child, the hormone level in the body will drop rapidly, and it is normal that the breast will become relatively smaller in the short term without artificial feeding during the breastfeeding period. It is advisable to wear a bra with steel support after the birth of a child, whether breastfeeding or not, as it will play a supportive role in not having sagging breasts; it is also advisable to do yoga properly after childbirth, which will have a positive effect on the body’s recovery.