According to a survey conducted by six national centers, the age of sexual development of children is generally earlier according to the current standard of living: 9.5 years old for girls and 11.3 years old for boys. If parents find that their children are developing earlier than this age, they need to seek medical attention in a timely manner. As people’s standard of living improves, children’s development and growth also advance. There is no clinical conclusion on how to distinguish precocious sexual development from normal development, and the debate focuses on the age limit. The same age criteria cannot be used for children in urban and rural areas, developed and developing countries. There is a consensus that girls with breast development, increased vaginal discharge, pubic and axillary hair, and menstruation before the age of 8 and boys with testicular development, penis enlargement, pubic hair and beard, voice change, and even sperm discharge before the age of 9 can be diagnosed as precocious puberty. In recent years, the number of children with precocious sexual maturity is indeed more than a decade ago, and the age of sexual development has also advanced, but the dangers of precocious sexual maturity are not really recognized by many parents. Precocious puberty can increase the risk of reproductive cancers. We have seen many children with precocious puberty in the clinic, but we feel that many parents are not really aware of the dangers of precocious puberty, most of them only know that precocious puberty can cause children to grow taller, but they do not know that precocious puberty can increase the risk of reproductive cancers in adulthood. Precocious puberty can also bring many psychological problems to children. Precocious puberty means that the child’s physiological age is earlier than the psychological age, and if parents do not guide the child in time, it can bring unnecessary harm to the child. If a girl has central precocious puberty, it means that she has the ability to have children, which can be a safety hazard if there is no timely intervention and guidance. Because of the lack of awareness of the dangers, many parents find that their children have precocious puberty, and the measures taken are not very well in place. The parents of boys need to pay more attention to 60% of girls suffering from this kind of precocious puberty can not find a clear cause, will be manifested as breast development, menstruation and so on. Eighty percent of boys suffer from this type of precocious puberty due to the presence of organic lesions, most commonly intracranial tumors, which can manifest as enlarged testicles, growing throat nodes and beards, etc. The majority of girls are found to be early and late, as girls tend to show breast development, which is easy to detect. The first manifestation of precocious puberty in boys is testicular enlargement, which is hidden and not easy to find, and when the beard and throat knot grow, it is already in the middle and late stages, so parents of boys should be more careful. After the diagnosis of precocious puberty, the cause must be identified. If it is a tumor, surgery is needed; if it is a central precocious puberty problem, supplemental specialist drugs are needed. In addition to central precocious puberty, there is also peripheral precocious puberty and partial precocious puberty, which are not true precocious puberty, but are also prone to develop into central precocious puberty if there is no active intervention. A special reminder to parents to keep the birth control pills at home. She has seen many cases of children who have accidentally ingested the pill in the clinic. Some of the children’s families are in the farming industry and the pill for animals is accidentally ingested by the children. The good living conditions nowadays make children eat a lot of high-protein food, and the increase of estrogen in the environment has increased the number of children with precocious puberty, and the age of children is also early. Not long ago, a survey conducted by six national centers in which the hospital participated redefined the age of sexual development of children according to the current standard of living: 9.5 years old for girls and 11.3 years old for boys. If a girl’s breasts develop by the age of 8 weeks and a boy’s testicles enlarge by the age of 9 weeks, take your child to a pediatric endocrinologist promptly. Parents should pay close attention to their children’s development, in addition to taking precautions in advance in their daily lives. The factors that cause precocious puberty in children are complex and varied, and may be related to a variety of factors as follows: 1. The accelerating trend of growth and development. Due to the improvement of living standard, nutrition, and the reduction of diseases, the sexual development and sexual maturity of this generation of children are advanced. 2, the impact of environmental pollution. Foreign literature reports that substances discharged into the environment by the washing, pesticide and plastic industries and their decomposition products can produce environmental hormone-like pollutants, all of which are found to have estrogenic activity and are absorbed through water sources, food and skin, becoming the cause of the promotion of pseudosexual precociousness and true sexual precociousness. 3. Intake of food or drugs containing sex hormones. Nowadays, many parents give their children items containing large amounts of sex hormones such as ginseng, royal jelly, pollen, chicken embryo and silkworm pupae. 4, the influence of social and psychological factors. Such as television, movies, newspapers, magazines, etc., and sex-related content than before significantly increased, some children can be very early from the film and television contact beyond their psychological age of behavior images. 5, the influence of disease. Such as intracranial tumor, adrenal gland disease, thyroid disease, genetics, ovarian disease, liver disease and other factors may cause children to develop precocious puberty. The main reasons that may cause precocious puberty in children are as follows: 1. increased hormone-containing substances in food; 2. hormone-containing cosmetics; 3. children mistakenly taking birth control pills; 4. adverse stimulation from film and television footage; 5. certain chemical materials used in home decoration; 6. excessive sunlight hours.