The height and weight development standard for three-week-old boys is an average height of 96.8cm; when it is lower than 93.0cm, it is short; when it is lower than 89.3cm, it is short. The average weight is 14.65Kg; when it is lower than 13.13Kg, it is necessary to consider whether it is thin in combination with height level; when it is lower than 11.79Kg, it is necessary to consider whether it is wasting in combination with height level; when it is more than 16.39Kg, it is necessary to consider whether it is overweight in combination with height level; when it is more than 18.37Kg, it is necessary to consider whether it is obese in combination with elevated water. When a child is short and obese, it is necessary to ask a child health care doctor or a growth clinic doctor to make a comprehensive and systematic assessment of the child’s growth level, especially to determine whether medical intervention is needed for the problem of short stature.