Thirteen-year-old boy is in puberty development stage, height fluctuations, in 154 ~ 174cm are normal. Boys 13~14 years old for the early puberty, height growth rate is the fastest, fluctuations are also large, in 154~174cm are normal. After entering puberty, children’s height can increase 7~9cm per year on average, until 23~26 years old to stop growing. It should be noted that height is affected by genetic, nutritional, environmental and disease factors, individual differences are large, some may be on the high side, some may be on the short side, but as long as the child’s diet, sleep, mental state and so on good, basically belong to the normal. However, if the height of a thirteen-year-old boy is significantly different from that of children of the same age, it is recommended that he seek medical attention in time to avoid affecting the normal development of the child.