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By the fifth or sixth month of pregnancy, the breasts are fully capable of producing milk. As in puberty, estrogen controls the growth of the ducts, and.

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The growth of breasts happens during puberty. In this stage, testosterone and estrogen levels are constantly changing in the body, which causes alterations to breast size and shape. During puberty, the estrogen hormone stimulates the growth of milk ducts in the breasts. The more ducts that are stimulated to grow, the larger the breast will become.

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Stage I. The first stage of development is the preadolescent stage where the nipples or papilla starts to get elevated from the chest level. However, .