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Sunday, 26/7/2026 | 09:01 GMT+7

Why do children of the same age have different heights?

A child's height is influenced not only by age but also by genetics, nutrition, sleep, physical activity, and overall health.

Many factors influence a child's height, leading to varied growth rates among children. Understanding these factors helps parents monitor their child's development properly and avoid unnecessary worry.

Genetics play a significant role in determining a child's height. According to Times of India, if parents are tall, their children generally have the potential to achieve better height as adults. However, a child's final height results from a combination of genetic potential and various factors impacting growth throughout development.

Each child also has a unique growth rate. This is a common reason why children of the same age can have different heights. Some children grow quickly in their early years, while others develop slower and experience a growth spurt during puberty. Girls typically enter puberty and experience height growth one to two years earlier than boys.

Nutrition is crucial for bone development. A child's body needs nutrients to build bones, develop muscles, and increase height. Protein is a fundamental building block for body tissues and plays an important role in growth. Calcium, vitamin D, vitamin K, phosphorus, magnesium, and zinc all contribute to healthy bone development.

An unbalanced diet, prolonged picky eating, or focusing on only a few food groups can lead to essential micronutrient deficiencies in children, impacting physical development. Children should eat a diverse range of foods, including: dairy, fish, eggs, lean meats, legumes, green vegetables, fruits, and whole grains.

Parents should regularly monitor their child's height to assess growth rate. Photo: Kim Uyen

Beyond nutrition, sleep is vital for a child's height. Growth hormone is secreted most abundantly during deep sleep at night. Children who frequently stay up late or do not get enough sleep can disrupt this hormone secretion process.

Physical activity stimulates bone and muscle development. Children who regularly run, swim, cycle, play basketball, or badminton improve their musculoskeletal strength and support growth. According to Parent, children who spend too much time on phones or computers or are inactive reduce their opportunities for physical development.

Underlying health conditions can also affect a child's growth. Children with chronic illnesses such as severe asthma, congenital heart disease, kidney disease, malabsorption disorders (like celiac disease), thyroid disorders, or growth hormone deficiency may experience slower height growth. Early puberty is another notable cause; children may grow quickly initially, but their growth plates close prematurely, resulting in a shorter adult height than their potential.

If a child experiences very slow height growth over a long period or is significantly below growth chart expectations, parents should seek medical consultation.

Le Nguyen (Compiled)

Readers can submit questions about childhood illnesses here for a doctor's response.
By VnExpress: https://vnexpress.net/vi-sao-tre-cung-tuoi-nhung-chieu-cao-khac-nhau-5101575.html
Tags: children height

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