Parents should go to the hospital if they notice development before the age of 8 years for girls or 9 years for boys. Sometimes parents are not sure when their child developed. Although the child is no longer at the age of precocious puberty, it is recommended that they also go to the hospital if the development has become more obvious. Some children are fat and their breasts look as if they are developing, so it is best to check the ultrasound of the breasts, except for breast development. How to determine if your child has precocious puberty 1. Girls: mainly observe if your child has breast development, breast enlargement or (and) breast tenderness, secretions in the underwear, and some children may have pubic hair first. 2. Boys: Observe whether there is pubic hair and whether the penis becomes longer and thicker. Since children of this age tend to bathe by themselves, if parents do not pay attention, they often do not find the development of their children, especially boys, so it is important for parents to pay proper attention to the development of their children. If you find that your child has premature development, you must consult a doctor as soon as possible, so as not to delay your child’s treatment. Before visiting a doctor, foreign patients can consult me by phone and ask for advice on registration and examination and other precautions when visiting a doctor. What tests are needed for children with precocious puberty 1. Bone age: It can determine whether the bone age is advanced and predict the adult height. 2.Sex hormone level: general check of sex hormone six items. 3.B ultrasound: check breast, uterus, ovaries, follicle size (or boy’s testicle size), determine sexual development, also need to check adrenal function or B ultrasound. 4.Magnetic resonance imaging (MRI) of pituitary gland: Since pituitary gland is the central system of endocrine, especially for those who suspect central precocious puberty, it needs to be checked. 5.Some children with precocious puberty also need to check alpha-fetoprotein (AFP) and chorionic gonadotropin (HCG) to exclude germ cell tumor, etc. It also needs to check blood thyroxine level (low A can cause precocious puberty). For those who consider the possibility of true (central) precocious puberty, it is necessary to check the LHRH excitation test, referred to as sex hormone excitation test, to determine whether it is true or false precocious puberty.