The average height of a child at birth is about 50cm and can reach about 75cm at the age of 1 year. 2 years old is generally 85-87cm in length, with an average annual growth of 5-7cm. but because children’s growth and development is affected by genetics, race and acquired factors, as well as individual differences, the values referenced in the standard height evaluation of children are the average range of height for that age group and do not represent individual levels. Even if the height is temporarily outside the standard range, parents should not feel worried, but can refer to the following ranges for preliminary judgment: 1. Girls: 1. 2-4 years old: average height of 83.3-97.68cm; 2. 4-6 years old: average height of 105.7-109.7cm; 3. 6-10 years old: average height of 119.6-145.1cm. in addition to the reference range, the height of children aged 2-12 years old can also be projected by the formula, the formula is height ( cm) = age (years) × 7 + 75 (cm). However, the above height standard is only for reference, and this data should not be used as the only criterion for evaluating children’s height level, and the excessive pursuit of the so-called standard may have undesirable consequences. However, if a child’s height differs significantly from the standard value, and if the child’s height increases by less than 5cm per year, it is necessary to be alert to the possibility of growth retardation, and it is recommended to seek medical attention to clarify the cause.