I never struggled to breastfeed, despite my [small, but perky] A cup boobs.  In fact, all the fat women in mine and my husband's families claimed I would have to bottle feed since there was no way my small breasts were going to make enough milk to feed my kid.    Turns out, my little breasts over produced milk.  My kid never got a drop of formula. Oh, and my younger sister, whose boobs are the same size as mine, produced so much milk that she donated extra milk for 1.5 years.