The height of adults depends on the growth rate of height in childhood, and the speed of height growth in childhood is related to genetics, the presence or absence of nutritional diseases, and the good or bad environment. 1, the average height of male and female infants at birth is 50cm, the minimum can not be less than 47cm; 2, after birth to 3 years old for children’s height growth for the first rapid growth period. 3, the first year after birth height growth of 20 ~ 25 cm, full one year old child’s height can not be less than 70cm; 4, the second and third year after birth height growth of at least 8 ~ 10cm; 5, full two years old, the child’s height can not be less than 80cm; 6, full three years old, the child’s height can not be less than 89cm; 7, after 3 years old, the child’s height growth gradually slow, annual growth of 5 ~ 7 cm. cm. Adolescence, the second rapid period of children’s growth and height, puberty begins at the age of 10 to 12 years for most children, rapid growth generally lasts 2 to 4 years. The height growth during puberty is generally 25~40 cm for boys and 15~25 cm for girls. The rapid growth of height during puberty is accompanied by the appearance of secondary sexual characteristics: voice change, beard growth, appearance of laryngeal nodes, external genital development, etc. for boys, and breast development and menstruation for girls. After puberty, height growth becomes slow again, and later the epiphyseal healing period, i.e., the “closure of the bone gap”, stops. Epiphyseal healing most children in the 1-2 years after the age of 16, the so-called “23 also scampered”, that is only for a very small number of children with delayed youth, most children after the age of 20 will not grow in height. If the height of 14-year-old boys is less than 148cm and girls is less than 146cm, you should find a specialist as soon as possible and take active measures to not delay the growth opportunity.