In the menstrual cycle, the breasts are enlarged by premenstrual h2o retention and temporary development as influenced by altering hormone amounts.[55] Pregnancy brings about elevated levels of the hormone prolactin, that has a crucial role from the creation of milk. Even so, milk output is blocked through the hormones progesterone https://grok.com/share/c2hhcmQtMw%3D%3D_21b4ddf4-c274-418a-a078-c9d2af4898ff