Growth is the normal process of growing in body size, and there are two different growth patterns from birth to adolescence. The first (from birth to about 2 years of age) is a rapid but gradually decreasing growth pattern. The second (from about 2 years of age to puberty) shows a pattern of continuous and steady growth from year to year.
Children’s height is relatively consistent among their peers. There are exceptions within the first year of life, when some children grow faster or slower than their peers before establishing their own final growth pattern, mainly due to genetic factors. growth variability up to 1 year of age is partly due to maternal factors (e.g., uterine size). There are slight differences in growth rates between boys and girls during infancy.
Length growth is measured before the age of 2 years, with the child in a lying position. after the age of 2 years, height is measured with the child standing.
The average length at birth is 50cm, the fastest growth in length in the first year after birth, about 25cm; the first 3 months of length growth of about 11-12cm, about equal to the growth value of the next 9 months, the length of about 75cm at the age of 1 year; the second year of length growth slows down, about 10cm, that is, about 85cm at the age of 2 years; after the age of 2 years height growth of 5-7cm per year. 5 years old to reach the birth length of two times. After the age of 2, the growth rate decreases to less than 5cm per year. If puberty is delayed, the growth of height may actually stop.