Is it permissible to undergo breast augmentation surgery in cases of extreme smallness, sagging, and atrophy, and the inability to breastfeed naturally with ease? Does this fall under removing a defect or increasing beauty?

It is permissible to undergo breast augmentation surgery if their small size hinders breastfeeding and causes the woman embarrassment with her husband, because it is considered the removal of a defect, not an enhancement. Sheikh Ibn Uthaymeen indicated the permissibility of breast augmentation if they are small and do not provide enough milk for the child.