You should make an appointment with your plastic surgeon to see if you should get a revision done. The final shape of your breasts will start to look its best approximately three (3) months after surgery. It takes time for the skin and muscle to stretch and relax around the new implant. The...
Don't loose hope. Your nipple sensation could still return. In terms of breast feeding, your breast will still produce milk so all should be fine. Best, Dr. Nazarian
Since you are torn between 310 and 340, I would put one in each side of your bra so that you can compare and see which one looks better. Hope this helps -- Dr. Nazarian