This picture shows the man on the left and the woman on the right. Children's height development will be affected by many factors such as heredity and nutrition, and the growth rate of different age groups is also different. At present, children's physical development can be roughly divided into three stages:
Within 3 years old (rapid growth period): the growth rate of children is the fastest in the first year after birth, with an average of about 25 cm; In the second year, the height increase can reach 10 cm.
3 years old-before puberty (stable growth period): the annual height increases by about 5-7 cm.
Puberty (growth acceleration period): the growth rate of children is accelerated again. The average growth rate of adolescent girls is about 7-9 cm per year, and that of boys can reach 8- 10 cm per year.
Calculation formula of teenagers' height and weight
1. The commonly used standard weight calculation formula in China is Broca's improved formula.
Male: standard weight (kg) = height-105 (cm)
Female: standard weight (kg) = height-107.5 (cm)
2. Standard weight (kg)
Male = [height (cm)-100] × 0.9
Female = [height (cm)-100] × 0.85
In the above two formulas, the normal weight is within plus or minus 10% of the standard weight, and 20% is obese.
3. Body mass index
Body mass index = weight (kg) ÷ height (m2)
Body mass index < 18 is thin, 18-20 is thin, 20-24 is normal, 24-26 is overweight, and > 26 is overweight.