Height refers to the vertical distance from the top of the head to the bottom of the foot, which reflects the level and speed of growth of the whole body. Therefore, the formula for calculating children’s height should also be differentiated according to the specific age, compared to the length at birth, which is about 1.5 times at the age of 1 year, and the height of 2-12 years old can be calculated according to the formula of age x 5 + 75 cm. The approximate value, which is only a rough estimation method, needs to be alerted to growth disorders if it is lower than the corresponding value for age, while higher than the corresponding value does not mean overdevelopment. after the age of 12, there is a large variation in height due to the beginning of development, and there is no clear formula for calculating height. As it is difficult to measure accurately when children under 3 years old are standing, they are measured in the supine position, and the result is the length. 3 years old and above, when measuring height, the subject takes off shoes and socks, stands on a wooden board, takes an upright posture, looks straight ahead with both eyes, chest slightly raised, abdomen slightly tucked back, both arms naturally hanging down, fingers together, heels against the wall, and pays attention to the fact that the eyes of the measurer should be on a level with the slide measuring board.