A child’s height is affected by many factors, including genetic factors, environmental factors (e.g., amount of sunlight), and the child’s nutritional status, diet, immune function, and diseases during growth. Estimation within the approximate normal range is done in two ways, as follows: First, measurement of the left wrist joint orthopedic film, i.e., the detection of bone age, which can roughly define the range of the child’s height curve, and can measure the child’s height. Second, according to the genetic elevation of the parents, (father’s height + mother’s height + 13)/2 ± 5 is the genetic height of the boy, (father’s height + mother’s height – 13)/2 ± 5 is the genetic height of the girl, to comprehensively analyze all aspects of the factors in order to most correctly estimate the child’s height.