The normal height of a 5-year-old boy is estimated to be 110cm, which may vary slightly due to different body types. A 5-year-old boy with a height of 106cm should be observed first, and it is normal if no other symptoms follow and he is able to continue his growth and development. The growth pattern of height is similar to that of weight, non-equal increase, the younger the age, the faster the growth, infancy and puberty are the two peaks of growth, the average length at birth is 50cm. The average length at birth is 50cm, and the height at the age of 2~6 years is about age (years) x 7+75 (cm). The normal height of a 5-year-old boy is estimated to be 110cm, which may be slightly different due to differences in physique, and the height of a 5-year-old boy is 106cm, which can be firstly observed when it is not accompanied by other symptoms. The growth of height is related by genetic, endocrine and other factors, short-term diseases and nutritional fluctuations are not easy to affect the growth of height, if the development is slow in the later stage, you should go to the hospital to find out the reason.