For girls, breasts begin to enlarge during the 10th year. The breasts typically reach full size in about three years, but the mammary glands do not mature fully until

Question

Quizplus · Accepted Answer

Breast development in girls begins during puberty, and while the physical size of the breasts may stabilize in the late teens or early twenties, the mammary glands themselves do not fully mature until a woman becomes pregnant. Pregnancy triggers hormonal changes that fully develop the mammary glands for lactation.

For Girls, Breasts Begin to Enlarge During the 10th Year