This is what even children know from kindergarten, what's not clear about this? Even in advertising on TNT say, between cartoons in the morning.
Human growth is a multifactorial trait, that is, it depends on both genes and environmental factors.
To assess the contribution of genetics, scientists usually resort to twin studies. In such studies, scientists compare the differences between identical twins (which are genetically identical, so any differences are the result of external factors) and fraternal twins (they differ both genetically and the influence of external factors).
The results of one of these studies were Published in 2016 in Scientific Reports: https://www.nature.com/articles/srep28496.
In this work, scientists analyzed 86,037 pairs of twins from 20 countries, aged 1 to 19 years. It turned out that the contribution of genes to human growth increases with age and reaches 83% in men and 76% in women, while at the age of 1 year, the child's growth is almost 50% dependent on external factors (48% in boys and 49% in girls).
Most likely, a person's height in infancy is significantly influenced by the onset of labor, as well as dietary habits and some diseases. In adulthood, external factors have a less significant effect than genes.
A special hormone, growth hormone, is responsible for the growth process in the human body. Under its action, there is an increase in the length of bones and soft tissues. The growth process itself is complex and uneven. At birth, the growth of an infant is usually about 50 cm, during the first year of life, the child grows by 50%, during the second - by another 20%. Active growth also occurs during puberty. By the age of 16-20, a person achieves the growth that will be constant for many years.