Everyone wants to have a reasonable height, too tall is not good, too short is also very distressing, short stature may be due to physical diseases, some may be due to genetic factors, either way the cause of the need to find specific reasons. 1, parents short on children’s height has an important impact on parents and siblings share children’s genetic 1/2, grandparents, uncles, aunts for 1/4, and nephews, nieces and nephews accounted for only 1/8. because of genetic shortness is called “familial shortness”. These short children show that the growth rate is normal, the growth curve and normal children’s curve parallel, but always in the low limit, in kindergarten or elementary school class height queuing, often in the forefront. They are not physically ill, their intelligence is normal, and their laboratory tests are normal. These children’s puberty comes on time, and they are also short in adulthood. 2, delayed puberty growth delayed short stature in childhood, puberty growth and sexual maturity late, adult height is normal. These children’s parents are of normal height, but their puberty comes late, such as the father grows vigorously after the age of 16 to 17 years, and the mother’s menarche comes after the age of 14 years. The same is true for their children due to genetic predisposition. These children are of normal height at birth. The growth rate is slower than that of children of the same age from 6 months to 2 years of age, and after 3 years of age, the growth rate is normal, the growth curve is parallel to that of normal children, and the epiphyseal closure is 2 to 3 years later, so they have normal growth potential. However, before puberty, they appear short compared to children of the same age, and puberty height growth, boys after 16 years of age, girls after 14 years of age, and finally adult height is normal. 3, the birth of a small child full-term birth of children weighing less than 2.5 kilograms is called full-term small children. There are also preterm small-sized children. These children in the mother’s uterus growth retardation. There are various reasons for this, such as the mother’s nutritional deficiencies, severe vomiting and little food intake in response to pregnancy; placental and umbilical cord factors and mother’s illnesses during pregnancy, and so on. According to China’s information, the incidence of small children about 10%, about 15% of these children are still short in adulthood. 4, mental suppression can inhibit the secretion of growth hormone Emotional deprivation dwarf, such as children are discriminated against, caused by abuse, once the environment is changed, they will be normal growth. Growth hormone deficiency is caused by insufficient secretion of growth hormone by the pituitary gland. The majority of the causes are unknown, and about 2/3 of the children have a history of breech delivery. This patient is particularly short, 1 ~ 2 years after birth, began to grow very slowly, only 1 ~ 3 cm per year, the average adult height of 137 cm, shortness is proportional, that is, limbs, head and torso proportional shortness, bone age is significantly behind the actual age. Their other internal organs were normal and their intelligence was normal. 6.Hypothyroidism is caused by insufficient secretion of thyroid hormone. The majority of congenital hypothyroidism is caused by congenital underdevelopment or underdevelopment of the thyroid gland, and most of these children are normal at birth. In the neonatal period, children may show sleeping, crying, moving less, jaundice for a long time, cold limbs, low body temperature, constipation, abdominal distension, feeding difficulties, etc. Later on, they may show slow growth and mental retardation. 7.Congenital Ovarian Hypoplasia This disease only occurs in girls, and is caused by sex chromosome abnormality. Normal female blood chromosome is 46xx, this patient lacks an x chromosome, i.e. 45×0. There are many manifestations of this disease, but almost all patients have short stature and slow growth. The child reaches puberty with no female characteristics, no breast enlargement, no pubic hair, no menstruation, and adult sterility. In those who have this disease, there are no ovaries on “ultrasound” examination. The ovaries are estrogen-producing organs, so the patient lacks femininity and is amenorrheic and infertile. In addition to the above, it can also be manifested as the distance between the two nipples, elbow extensor and so on. 8, cause dwarf systemic diseases chronic malnutrition, chronic diarrhea, congenital heart disease, respiratory disease, anemia, kidney disease, infection, etc. can cause pediatric growth disorder.