The range of children’s height growth varies according to age and sex, with an average increase of 25.3 (female) to 26.1cm (male) at the age of 1 year, 12.0cm in the second year, 8.3cm in the third year, and an average of 6.0-7.0cm/year at the age of 3-8 years, with the growth rate of girls slowing down at the age of 8-9 years and boys at the age of 9-10 years, and then accelerating as they enter puberty. The length of infants increases by about 25.3 (female) to 26.1 cm (male) in the first year after birth (range of variation 23.4-28.0 cm), 12.0 cm in the second year (range of variation 10.6-13.7 cm), and 8.3 cm in the third year (range 7.6-9.0 cm). the average growth rate for the age of 3-8 years is 6.0-7.0 cm/year (5.0-8.0 cm). The growth rate slows down at 8 to 9 years of age for girls and 9 to 10 years of age for boys (4 to 6 cm/year). During puberty, height increases rapidly. Height begins to accelerate after breast development in girls (about 9 to 12 years of age) and after testicular enlargement in boys (about 11 to 14 years of age), and approaches adult height after 15 years of age. When children’s height growth is low, parents should take them to the hospital in time for standardized treatment under the guidance of doctors.