The document discusses the normal physiological process of puberty in humans. It describes the prepubertal period and the three changes that occur: adrenarche, decreasing repression of the hypothalamic-pituitary system, and gradual amplification of the interaction between GnRH and gonadotropins. It also discusses the stages of pubertal development, timing of puberty which is influenced mostly by genetics, and average ages for the different Tanner stages of breast and pubic hair development.