There is certainly also considerable variation in dimensions among folks. Permanent breast progress during puberty is a result of estrogens at the side of the growth hormone. Feminine human beings are the sole mammals that permanently build breasts at puberty; all other mammals acquire their mammary tissue throughout the latter https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb