In medical measurement of dwarfism, the presence of short stature is usually evaluated by the percentile method or standard deviation method, so there are mainly the following diagnostic criteria for childhood dwarfism: 1. The percentile method refers to the child’s height being less than the 3rd percentile of the average height of the normal population of the same race, age and gender. In layman’s terms, for example, if 100 Chinese children of the same age and same gender are lined up from the highest to the lowest, the 3rd percentile is the 3rd from the bottom. For example, the height of adult Chinese people is about 1.7m. According to the degree of dispersion, standard deviation is developed, and the farther from the average, the closer to dwarfism. If the growth rate is less than 5cm per year, we should consider whether there is dwarfism.