There's also considerable variation in dimension among individuals. Long lasting breast progress in the course of puberty is caused by estrogens at the side of the growth hormone. Feminine individuals are the only real mammals that permanently establish breasts at puberty; all other mammals produce their mammary tissue during the https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb