Large breasts after pregnancy will shrink to some extent after birth, especially after breastfeeding is over. During pregnancy, due to the large secretion of estrogen and progesterone levels in the body, the breasts will show signs of getting bigger. After giving birth, the breasts will also increase in size when they are full of milk due to the sucking of the fetus and the secretion of prolactin in the body. However, as the level of estrogen and progesterone in the woman’s body gradually decreases, her breasts will gradually become smaller after she stops breastfeeding. When breasts enlarge after pregnancy, it may also be accompanied by swelling and pain. It is recommended to wear loose and comfortable underwear to avoid squeezing the breasts. When breastfeeding, it is recommended that you alternate between left and right breasts, and pay attention to maintaining cleanliness and hygiene, and properly care for your breasts to avoid mastitis. In conclusion, it is a normal physiological phenomenon to have big breasts after pregnancy and smaller breasts after giving birth, and there is no need for special treatment.