Most parents come to the clinic because their children are shorter than their peers, ignoring the normal development of secondary sexual characteristics. Here we will introduce somatic puberty and delayed sexual development. It is one of the most important causes of delayed puberty and sexual development in children. It has a certain family genetic tendency and may be related to the delayed developmental maturation of the hypothalamus in regulating endocrine changes during puberty. Clinical manifestations: Lack of development of any secondary sexual characteristics in boys aged 14-17 years or girls aged 13-16 years, its for the affected children to be healthy, short and childish, but their height growth rate is close to normal, about 5 cm/year, 60% of children whose family members have a history of similar late maturity. Eventually the height can reach the level of normal children. Diagnosis: Since somatic puberty and delayed sexual development is a normal and specific state rather than a disease, pathological puberty and delayed sexual development must be excluded before diagnosis can be made. 1. The growth rate of children is basically normal, but the age of puberty is behind, and the bone age is behind. 2. The development of secondary sexual characteristics is more than 2 standard deviations behind the average developmental age of normal children. 3, There is a similar family history. 4.All examinations (including GnRH stimulation test) were normal. 5. The development of sexual characteristics and growth spontaneously appear when the bone age reaches the pubertal development age. Since children with somatic puberty and delayed sexual development can eventually develop puberty spontaneously, they generally do not need treatment and must be closely followed up under the guidance of a doctor to understand the child’s growth and development and to detect certain hidden pathological factors in a timely manner. However, treatment is needed for children with severe psychological and behavioral problems due to immature sexual development and short stature. Specific consultation at the endocrinology department is available for further treatment.