The standard height of a nine-year-old girl is 138cm and the standard weight is 26kg. 20% of the standard weight is overweight, which may be obesity; 20% of the standard weight is underweight, which may be malnutrition; 20% of the standard height is short for short stature; if the height is too short, more than 30% is growth retardation; of course, if the height is more than 20% of the standard height, it is high stature. It includes endocrine diseases, of course, there are also nutritional and genetic factors, so we must go to the pediatric endocrinology department for an interview, bone age measurement, growth hormone, thyroid hormone and sex hormone levels, to rule out endocrine diseases and then treat the symptoms.