There is certainly also considerable variation in sizing involving men and women. Long term breast advancement during puberty is a result of estrogens together with The expansion hormone. Female human beings are the only mammals that completely establish breasts at puberty; all other mammals acquire their mammary tissue throughout the https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb