#AskTheExpert my nipples are flat from the day of discharge from the hospital I am trying to breast feed him but I didn't achieve the full success some time he feed and some time not so i give him both breast feed ,mother milk by expressing thru pump and formula when he was 1 month and 2 month he takes lot of time in breast feeding one hour after that again' he feed so i require 3 or 4 hr to feed him but after 3 month his feeding tym is decreasing just 5 min and sometimes he does not feed so I give him bottle and feed him mother millk by expressing.also Direct feeding him and formula also he has asd of size 12 mm