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The Average Breast Size of a Woman

Breasts are significant features of the female anatomy. Girls may start to develop breasts as early as 8 years old, but breast development may not start until the early teens. Most women’s breasts are fully developed by the time they reach their early 20s, and breast size will remain fairly stable, though it may fluctuate due to overall weight gain or pregnancy. Breast size is unique to each woman and is generally dictated by genetics.