The normal height of 12 years old is about 150cm or more, which is the average value, as long as it is above 150cm is considered standard. By the age of 13, there is about 160cm, if lower than this standard, by the time of adulthood, that is, 18 years old, height will not be too high, so 13-16 years old this stage, is the key stage to determine height. To exercise more, you can do stretching exercises, you can play more basketball, badminton, etc. To supplement more nutrition, you can consume more food containing calcium and zinc, which can promote the growth of bones, also to ensure sufficient 8 hours of sleep, good sleep can promote the secretion of growth hormone.