There is certainly also substantial variation in size involving men and women. Everlasting breast growth through puberty is attributable to estrogens together with the growth hormone. Female humans are the one mammals that completely create breasts at puberty; all other mammals establish their mammary tissue over the latter period of https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb