You can find also appreciable variation in measurement amongst people. Lasting breast development all through puberty is due to estrogens in conjunction with the growth hormone. Woman humans are the sole mammals that completely develop breasts at puberty; all other mammals produce their mammary tissue during the latter period of https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb