The most significant factor which decides your height is genes — the basic and functional unit of heredity itself. They play an important role in determining physical traits, i.e., whether you have curly or straight hair, long or short legs, or even what your smile might look like.
Scientists have identified over 700 different genetic variants that influence height, with each variant contributing a small effect. These genes are inherited from both parents, which is why children often resemble their parents in terms of height.
How do we approximately figure out the height of a baby?
While height inheritance is decided by complex genetics, researchers often use a formula called the mid-parental height calculation to estimate a child’s potential adult height. While these do not promise accuracy of any kind due to how complex genetics are, it often helps with research.
For boys, the calculation is: (father’s height + mother’s height + 13 cm) ÷ 2.
For girls, it is: (father’s height + mother’s height – 13 cm) ÷ 2.
Which gene?
Within genes, there are specific ones which control various parts of growth, from the production of hormones to when a beard grows to how tall you are.
One important gene which has been strongly linked to height variation across human populations is the HMGA2 gene. Another critical genetic factor is the growth hormone receptor gene, which determines how effectively the body responds to growth hormone signals.
Other factors
While genetics plays a huge role, several other factors ensure that a person reaches their full potential height. From nutrition to hormones to regular physical activity, a growing body has so many needs that need to be met to ensure proper growth.
Other factors
An important nutrient for building tissues and muscles is protein. Insufficient protein often leads to stunted growth, making it all the more important to eat your leaf vegetables, eggs, meat, fish, beans, lentils, dairy and nuts!
Vitamin D is another nutrient which works alongside calcium to build strong bones. Without sufficient vitamin D, the body cannot absorb calcium effectively, which leads to conditions like rickets. Sunlight exposure is the primary source of vitamin D, but it is also found in fatty fish, egg yolks, and fortified foods. Other important nutrients needed for ensuring good growth include zinc (found in meat, shellfish, and whole grains), magnesium (in nuts, seeds, and vegetables), and vitamins A and C, which support overall growth and development.
Hormones
One of the most important hormones that plays a role in your height is the human growth hormone (HGH), produced by the pituitary gland located at the base of the brain. It stimulates the liver to produce insulin-like growth factor 1 (IGF-1), which directly promotes bone and cartilage growth. Thus, hormones in general play an important role in ensuring you reach your full height, and this includes testosterone, estrogen, and even thyroid.
Sleep
A critical and often forgotten factor which plays a role in height growth is sleep. Growth hormones primarily get released during deep sleep, so ensuring a growing child gets 8 to 10 hours of sleep is extremely important.
Physical activity
Regular physical activity is a must to ensure healthy growth as it helps to stimulate bone development, increase bone density and promote the release of growth hormone. Activities that involve stretching and flexibility, such as swimming and gymnastics, often promote good posture, which can make a person appear taller even if they don’t actually grow more.
Stress
Stress can also often impact height as chronic psychological stress elevates cortisol levels, which in turn can interfere with growth hormone production and reduce growth velocity.
All these factors are quite dependent as well. One supports the other, leading to a better growth spurt. While you cannot fully alter your height, understanding the biology behind your height can help you have a better lifestyle to optimise your growth potential.
Published – June 27, 2026 03:50 pm IST
