WHO vs. IAP Growth Charts: Which Should You Use?

What are WHO growth charts?

The WHO Child Growth Standards, published by the World Health Organization, describe how children grow under optimal conditions — the reference sample was built from healthy, predominantly breastfed children across multiple countries, studied specifically to show growth potential rather than just typical growth in any one population. They cover birth to 5 years and are the standard used internationally, including by India's own child health programs for tracking children under 5.

What are IAP growth charts?

The Indian Academy of Pediatrics maintains its own growth charts for older children, built specifically from measurements of Indian children rather than an international reference sample. The IAP's growth chart committee published a revised set of height, weight, and BMI charts for 5-to-18-year-olds in 2015 — replacing an earlier 2007 version — using pooled data from tens of thousands of Indian children across multiple regions, gathered specifically because growth patterns had shifted since the earlier charts were built.

Why does the same child plot differently on each chart?

A percentile is a comparison, not an absolute number — it tells you where a child sits relative to the reference group the chart was built from. Because the WHO and IAP charts use different reference populations, a child who's exactly average against one group won't necessarily be exactly average against the other. It's entirely possible for a child to sit near the middle of the WHO distribution and toward a different position on an India-specific chart, without either chart being incorrect — they're answering slightly different questions.

This is also the core reason IAP maintains its own charts for the 5-to-18 age range in the first place: for an older Indian child, growth measured against Indian population data is generally considered more clinically useful than growth measured against an international reference built primarily to describe growth in early childhood.

So which should a clinic use?

The practical answer most Indian pediatric guidance converges on is to use both, split by age: WHO Child Growth Standards for children under 5, and the IAP's revised charts for ages 5 through 18. A pediatric EMR that switches automatically between the two by age (and sex) saves a clinician from having to remember which reference applies at a child's next birthday, and keeps a growth trend visually consistent across a child's chart even as the underlying reference changes behind the scenes.

How PediaNex handles the switch

PediaNex's growth charts feature plots WHO standards automatically for children under 5 and switches to the IAP's 5–18 charts as a child ages past that mark, matched by age and sex at every visit — so a clinic doesn't need a separate workflow or a mental note of which chart a particular child is due for next.

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