The height of girls is related to age, heredity, nutritional status and many other factors, generally as long as the body is well-proportioned, good intellectual development and mental status are normal, normal height varies in each age group, as follows: 1. Generally, the length of a newborn baby is around 50cm; 2. At 3~12 months, the length is around 75cm; 3.1~6 years old, its height can be calculated by age (years)*7+75; 4.7~12 years old, its height can be calculated by age (years)*6+80; 5. After the age of 12, girls enter puberty to usher in another growth spurt. If daily exercise and nutrition are sufficient, the height of girls grows faster, but there are individual differences and no generalizations can be made. Therefore, there is no definite value for the normal height of a girl, as long as all her functions develop normally, she is of normal height.