You can find also considerable variation in size between individuals. Lasting breast development all through puberty is brought on by estrogens along side the growth hormone. Woman human beings are the only real mammals that forever acquire 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