How does a large difference in the size of my breasts affect breastfeeding?
A slight difference in size between one breast and the other is normal and does not affect breastfeeding. A major difference may indicate a problem in the smaller breast that has been caused by developmental or genetic conditions. Surgery and trauma can also damage a breast. The smaller breast may never make much milk. In this case, the normal, bigger breast often compensates for the less productive one. It is also possible for a breast to reduce the amount of milk it makes after the baby’s birth. Mothers need to make sure that the baby takes in enough milk. Babies may become reluctant to breastfeed on the smaller side or reject it completely.