Usually, 6 months after weaning, a woman’s breasts will gradually return to their pre-pregnancy state, and they will be slightly smaller than during breastfeeding, but usually not smaller than before pregnancy. During pregnancy and puerperium, due to the action of large amounts of estrogen and progesterone, the ducts of the breast gland are enlarged, the alveoli are enlarged and the fat is increased. After you stop breastfeeding, due to the decrease in hormone levels, the mammary glands gradually shrink, the phenomenon of glandular proliferation gradually decreases, and the filled milk is gradually reabsorbed, resulting in smaller breasts. During breastfeeding, the body consumes a lot of fat, which makes the body fat reserves disappear and makes the body shape thinner, which also makes the breasts smaller. The degree of breast reduction is related to the extent to which the mammary glands change during pregnancy and breastfeeding. If the breast size increases significantly during pregnancy and breastfeeding, the breast size may be more obvious after weaning. After weaning, women need to pay attention to breast maintenance to prevent breast shrinkage after weaning. You can eat more foods rich in high quality protein and vitamins, such as milk, eggs, lean meat, etc., to promote better breast development. Massage your breasts every day to promote blood circulation. You can also do exercises such as swimming, yoga and aerobics to help restore the shape of your breasts. You need to wear a proper bra everyday to avoid sagging breasts.