Growth science · Growth basics

Growth charts around the world: why every country needs its own

GrowSense Growth Science · Educational, not medical advice

There is no single growth chart for the world's children — and there is no scientifically sound "Asian chart" either. A child's percentile depends on the reference they're compared against, and that reference is a choice. This is the companion to our guide on what growth charts really mean: a country-by-country tour of the references clinicians actually use, and how much the answer moves as you cross a border.

Height genuinely varies across the planet. The largest-ever analysis — 1,472 studies, 18.6 million people, 200 countries — found the tallest people are Dutch men born in the late 20th century (over 182.5 cm on average), while the biggest century-long gains were in South Korean women (+20.2 cm) and Iranian men (+16.5 cm), and some countries in sub-Saharan Africa and South Asia changed little.^[3] A chart built on one of these populations will not describe another.

The two global frameworks

WHO provides the shared international backbone in two parts. The Child Growth Standards (birth–5 y) are prescriptive — built from children in six countries raised in healthy conditions, so they describe how children should grow.^[1] The 5–19-year curves are a reference, reconstructed from older data and linked to the under-5 standards.^[2]

The United States uses the CDC 2000 charts — built from five national surveys, revised from the 1977 NCHS version, and the set that first added BMI-for-age.^[4] Many countries historically borrowed CDC or WHO charts before building their own, which is exactly where the mismatches below come from.

How to choose a chart

A defensible hierarchy for any child:

1. the chart officially adopted by their national health authority;
2. WHO standards under age five (most countries endorse this);
3. WHO 5–19 for international comparison after five;
4. a validated contemporary national reference where one exists;
5. and always, the child’s own growth velocity and history over time.

East Asia

China

China has national height, weight and BMI references from large surveys.^[5] An updated 2013 reference (urban children) shows the relationship with WHO isn’t a simple “shorter” or “taller” — it flips by age and sex: Chinese boys were heavier than WHO around 6–10 years, median height ran above WHO for boys under 15 and girls under 13, then below WHO in later adolescence.^[6] That alone explains why “Chinese kids are shorter than WHO” is too crude a claim — direction and size depend on age, sex and survey year.

China has also grown fast: mean height at 18 rose from 168.2 → 172.2 cm in boys and 157.1 → 160.1 cm in girls between 1985 and 2019, with persistent urban–rural and east–west gaps.^[7] Use a contemporary Chinese chart for local comparison, WHO for international, and record the edition — one national median doesn’t represent every province.

Japan

Japan runs long-standing government growth surveys; the widely-used clinical curves come from the 2000 national survey, with mean and SD values by age and sex.^[8][9] Applying the WHO under-five standard to Japanese children overestimates short stature (and underestimates overweight) versus the Japanese reference^[10] — a clean example of classification changing with the yardstick, not the child. Japan’s history isn’t simply “ever taller,” either: adult-height gains slowed and may have slightly reversed in some cohorts, with rising low birth weight proposed as a contributor.^[11] Japanese national charts best describe Japanese children today; WHO stays useful for international screening.

South Korea

The 2017 Korean National Growth Charts are the modern national reference (height, weight, BMI and more for ages 3–18; WHO standards are used for younger children).^[12] Korea is also the textbook case for why charts must be updated: over fifty years, Korean children became dramatically taller^[13] — and Korean women posted the single largest century-long height gain of any population on earth.^[3] Old Korean averages badly misrepresent children growing now.

South Asia — India

The Indian Academy of Pediatrics revised its 5–18-year charts in 2015, pooling data from 14 cities (87,022 children screened; 33,148 used) with the LMS method, and recommending WHO standards under five.^[14] Crucially, the IAP sample was drawn largely from apparently healthy middle- and upper-socioeconomic children — deliberately, because a chart meant to detect undernutrition shouldn’t normalise the growth restriction that deprivation makes common. So the IAP median is not a census average of all Indian children, and Indian measurements are best read alongside regional and socioeconomic context.

Southeast Asia

Southeast Asia should never be represented by Chinese, Japanese or Korean data. The SEANUTS study built length/height percentiles for children aged ~0.5–12 across Indonesia, Malaysia, Thailand and Vietnam, and found pooled Southeast-Asian percentiles were a reasonable basis for assessing growth in the region.^[15] Even so, countries and their urban cohorts differ, and Singapore and the Philippines maintain their own approaches. For a child here, the order is: the national authority’s chart → WHO under five → WHO 5–19 for international comparison → a validated regional/national reference such as SEANUTS where relevant. There is no single defensible “Southeast Asian average” pulled from thin air — SEANUTS is defensible precisely because it defines its multi-country sample and method.

The Middle East

“The Middle East” is a geographic label, not one reference population — Saudi Arabia, Iran, Turkey, the UAE and others differ in ancestry, nutrition and obesity prevalence. Saudi Arabia has one of the region’s most complete systems: a preschool reference (15,601 children under five, LMS)^[16] and a school-age reference (19,299 children and adolescents).^[17] Applying the US CDC chart to Saudi children produced higher apparent rates of undernutrition, stunting and wasting than the Saudi national chart^[18] — reference-dependent classification again. Use the Saudi chart for Saudi peers; don’t stretch it across every Arab or Gulf population, which need their own representative data.

Europe

Europe has no single childhood-height distribution. A pooled analysis of national European references found a north–south gradient, substantial between-country variation, and an average secular rise of about 0.6 cm per decade.^[19] So “European average” depends entirely on which countries and years you include — and the Netherlands sits at the tall extreme, home to the tallest men measured anywhere.^[3]

The UK uses a pragmatic UK–WHO hybrid: UK data around birth and prematurity, WHO standards from early infancy to age four, and the UK 1990 reference from four through adolescence. Continental countries keep their own charts because distributions and pubertal timing differ. But the gradient doesn’t mean every northern child is tall or every southern child short — national distributions overlap heavily, and individual variation dwarfs any regional label.

Africa and Latin America

Most African and Latin American countries rely primarily on WHO standards, which is appropriate: the WHO under-five standard was explicitly built to be international and included sites in Brazil, Ghana and Oman among others.^[1] Where national references are thinner, WHO plus careful attention to trajectory and local context is the honest default — and, importantly, a lower national median in a country shaped by past deprivation should never be treated as the biologically ideal height for an individual child growing up healthy today.

Which chart for which population

Charts have expiry dates

Every reference above is a snapshot of one population at one time. Height shifts across generations — up sharply in Korea and China, slowed or slightly reversed in parts of Japan, ~0.6 cm/decade across Europe.^{[3][7][11][19]} A chart built decades ago can misclassify children growing today, which is why the honest read always names the reference and its year — not just a percentile.

The bottom line

Growth charts differ by country because children do — for genetic, historical, nutritional and socioeconomic reasons. That variety doesn’t make the charts unreliable; it makes naming the right one essential. WHO is the shared international frame; national references answer a local question; and the same child can sit at different percentiles on each without anything being wrong. Pick the reference that fits the population and the purpose, record its edition, read weight next to height, and watch the trajectory. A border can move a percentile. It cannot move whether a child is growing along a healthy, steady path — and that is the thing worth watching.

This article provides educational, population-level reference information. It cannot judge an individual child's growth or diagnose any condition, and national references differ in sampling and method. Discuss unexpected measurements or changes with a qualified pediatric healthcare professional.