Female puberty usually refers to the period of puberty, usually from 10 to about 19 years old, but there is a difference. Female developmental period is puberty, also known as the period of development of secondary sexual characteristics, refers to the hypothalamus – pituitary – ovary axis, the gonadal function of the developmental stage, usually in the case of girls in the 10-12 into the sexual maturity, in the 16-19 years of age to develop maturity, depending on the individual differences in the difference between the disparities. If the development is earlier than 8 years old, it is called precocious puberty, and if it is later than 13 years old, there is delayed development. The earliest manifestation of the developmental period is the rapid enlargement of breasts, followed by the onset of menstruation, and with the development of breasts, the appearance of armpit and pubic hair, voice thinning, and rapid growth in height. 15-16 years of age, there is an accumulation of fat, and generally stop growing taller at the age of 17-18 years. Girls who develop too early or too late in their developmental period are advised to seek timely medical treatment.