The age of the second female development is around 9-12 years old, but the age of development is related to a variety of factors, such as the child’s nutrition, genetic factors, socioeconomic factors, and emotional changes. The second female development indicates that the genitalia will change when puberty is reached, with the onset of menstruation, pubic hair growth, larger breast development, and armpit hair growth. The second female development stage is maintained for about 1.5-8 years, depending on whether it is related to adequate nutrition and genetic factors. For the adolescent stage of female to keep sleep, avoid staying up late and strengthen nutrition, adhere to the daily supplementation of high-quality protein, more sports, because this stage is a rapid period of height growth, more touch height, play ball, swimming, running, jumping rope, etc. can promote height growth, as parents to give the adolescent stage of children to do a good job of psychological care.