The average height of a 14-year-old boy is 165.9cm, and a 14-year-old boy has already entered puberty. If his height is one standard deviation above or below 158.7-173.1cm, it is generally normal and can be observed dynamically. However, if the height of a 14-year-old boy is lower than 151.5cm, which is equivalent to 2 standard deviations below the standard deviation of height, the child is considered to be short. 14-year-old boys who have entered puberty may grow early or late due to changes in the level of sex hormones, so it is necessary to give the child an examination of the bone age, i.e., the orthopantomographs of the left wrist joints, to make clear whether the child’s actual height is in line with the bone age and whether it is within the normal range. Whether it is within the normal range. If it is obvious that the child is lagging behind, it is necessary to actively give corrective treatment to avoid missing the best time for treatment.