Is it permissible for a wife to undergo cosmetic breast surgery if they do not return to their natural state after the nursing period ends, due to a difference in their size?

The difference in breast size due to breastfeeding is a known issue and is not considered a defect that permits cosmetic surgery unless it exceeds the usual limit and causes a disfiguring deformity. In that case, surgery is permissible to restore it to a moderate size, provided that the goal is to remove the defect and not to increase beauty. It is preferred that a female doctor performs it, and it is better to use drugs and medications if possible, rather than surgery.