Is Breast Growth Normal in Early Pregnancy?

Since milk does not come in until after the baby is born, what is enlarging my breasts now at 10 weeks pregnant? I have large breasts to start with and I have gone up a cup size already!

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Peg Plumbo CNM

Peg Plumbo has been a certified nurse-midwife (CNM) since 1976. She has assisted at over 1,000 births and currently teaches in the... Read more

Yes, you are correct that it is not milk enlarging your breasts in early pregnancy. The period of the most rapid breast growth is during the first eight weeks. The enlargement is due primarily to engorgement of the blood vessels, enabling increased circulation to the breasts. Thereafter, estrogen stimulates growth of the ducts, and progesterone stimulates growth of the glandular tissue (called lobules or alveoli).

Breast changes are individual and the range is zero to 800 cc of volume per breast; the average is about 400 cc.

It is not uncommon for women to increase by one or two cup sizes during pregnancy. This declines after weaning.

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