There may be also appreciable variation in measurement involving men and women. Lasting breast advancement in the course of puberty is attributable to estrogens at the side of the growth hormone. Feminine human beings are the one mammals that permanently establish breasts at puberty; all other mammals acquire their mammary https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb