For both boys and girls, the average height increase at 4-5 years of age is 7-8cm/year, and the growth figures are related to the child’s genetics, diet, exercise, sleep, illness and other factors. If the child is genetically taller, it may be more than this value. If the child eats a particularly good, balanced diet and is not picky about food, does not favor one food over another, and can ensure sufficient sleep every day, and can also ensure good bouncing physical activities every day, the child’s growth in height per year may also be higher than this value, and it may be possible to reach about 10cm. If the child is genetically short, eats poorly, sleeps poorly, exercises less, and has poor immune function and is prone to disease, the annual growth in height may be less than 5cm.