Can a woman breast feed if her breasts are really small?

Breast size has nothing at all to do with milk production (lactation). Small breasted women have no problem with producing perfectly adequate quantities of milk to easily nourish a baby, or more than one baby. The breasts will enlarge after delivery, but this won't last. In a week, or a few weeks, they'll go back to their normal size, but milk supply will be unaffected and then the good news is you won't need a bra unless you're uncomfortable without one. Be happy you have small breasts: at least they won't be heading for your navel as you grow older!