You can find also significant variation in size involving folks. Long-lasting breast progress in the course of puberty is caused by estrogens along with The expansion hormone. Female individuals are the only mammals that completely acquire breasts at puberty; all other mammals build their mammary tissue in the latter period https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb