There may be also substantial variation in size involving persons. Long term breast progress all through puberty is brought on by estrogens in conjunction with the growth hormone. Woman human beings are the sole mammals that forever build breasts at puberty; all other mammals establish their mammary tissue during the https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb