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How many centimeters can a boy grow in a year from the beginning to the end of his voice change?
At the same time as the development of subsidiary characteristics, the acceleration of height growth (sudden increase in height) is an important feature of adolescent growth. The sudden increase in height generally occurs in girls from the second half of breast development to 1 year, while in boys before and after voice change, it lasts for about one year. The sudden increase rate of girls is 8 ~ 9 cm per year on average, and boys are more than girls 1 ~ 2 cm.
After this period, the growth slows down, returning to the speed before puberty, that is, about 4 ~ 5 cm per year, and then after 1 year, it drops sharply to only 1 ~ 2 cm per year until the epiphysis is completely closed and stops growing, that is, it reaches the annual height. Deceleration time, before and after menarche for girls, after voice change for boys.
Extended data:
A large number of scientific studies have proved that long-term lack of sleep time and not taking part in outdoor sports will seriously affect the secretion of growth hormone and also affect the benign stimulation of epiphysis. Long-term high-tension life rhythm, unreasonable eating habits and no exercise make children obese, which leads to precocious puberty, metabolic diseases and nervous regulation system disorder, which seriously affects growth and development.
"We should learn from foreign parenting experience." Yu Shaomiao said that in foreign countries, from infants to school-age children, there is no early preschool education, and almost all of them grow up healthily and rapidly in sufficient, rich and scientific nutrition according to children's natural laws.
From primary school to junior high school, children's study time is basically controlled within five to six hours, and other time is spent on their own hobbies, and they grow up freely and healthily.
Zhejiang News-Eating too well, boys grow too early to 10 cm, ignoring their genetic height.
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