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No. When it comes to breastfeeding, bigger isn't better. Breast size is irrelevant.
The size of a woman's breasts is mostly determined by how much fatty tissue they contain. But this tissue doesn't have anything to do with the quantity of her breast milk.
Hormones – triggered by the baby's birth as well as by nursing – stimulate the mammary glands in the breasts to secrete milk and push it into milk ducts under the nipple and areola (the dark area around the nipple). When a baby sucks, the milk flows into her mouth.
(For more details, see Making breast milk: How your body produces nature's perfect baby food.)
Your breasts should get larger as they fill with milk – even during pregnancy as your mammary glands prepare for the job ahead. But the amount of milk you produce is usually determined by how much your baby nurses. The more the baby feeds, the more milk your breasts make.
However, if your breasts don't grow and change during pregnancy and they stay soft in the days after delivery, you may have a condition called insufficient glandular tissue (IGT). Moms with IGT don't have enough milk glands in their breasts to produce much milk. Your doctor or lactation consultant can assess your condition and advise you about ways to boost milk production and supplement with formula or donated breast milk.
For some women, smoking, previous breast surgery, certain medications such as birth control pills, and some medical conditions can also contribute to low milk supply. If you're concerned about your milk production, see your doctor or lactation consultant.