Breast size depends on how much fatty tissue you have. The larger the breast, the more fatty tissue and vice versa. It is the amount of glandular (milk producing) tissue in your breast that matters. If you follow your baby’s lead and breastfeed whenever your baby shows that she needs a feed (by squirming, grunting, mouthing her hands and nuzzling into your breast), you will have plenty of milk. Most mothers can make more than enough milk for their baby (or babies!). Indeed, having too much breast milk is common.

The amount of milk you can express is a poor measure of how much milk you are making. There are many mothers who breastfeed their babies just fine but who can’t express much. A baby who is feeding well triggers your let-down reflex and gets the milk from your breasts better than a breast pump can.