If there is a small difference in breast size, it may recover on its own. If there is a large difference, it may not recover on its own and will require medical treatment. If the difference in size between the two sides of the breast is small, it will recover on its own after weaning, and it usually takes a few months to become the previous shape. If the difference between the two sides is large, you can try to correct the difference in breast size by correcting the child’s habit of eating deviated milk while breastfeeding. If the difference in breast size does not return after a few months of weaning, you will need to consult a breast surgeon. In order to avoid the situation where both breasts are different in size after breastfeeding, you should take turns to breastfeed with both breasts during breastfeeding so that each breast has a chance to empty. This will prevent the appearance of small and large breasts and also stimulate milk secretion, and you can also give massage to the breast with bad milk to reduce the degree of small and large breasts. You should insist on wearing a bra during breastfeeding, otherwise it will lead to sagging due to the increased weight of your breasts, and you should also ensure the correct sleeping position, which is more conducive to the maintenance of breast shape.