There is certainly also considerable variation in dimensions in between people today. Everlasting breast growth throughout puberty is because of estrogens along with The expansion hormone. Woman people are the only real mammals that permanently establish 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