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INTERGROWTH-21st Growth Chart

Neonatal Growth Charts — Oxford

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1 What is the INTERGROWTH-21st Growth Chart?

INTERGROWTH-21st is the international newborn size and postnatal growth standard developed by the University of Oxford, built from a multi-country, prescriptive-standard cohort in the same tradition as the WHO Child Growth Standards. PediAid links directly to Oxford's own manual-entry tool rather than re-implementing its reference curves, so results always match the official published standard.

2 When to use it

  • Plotting newborn size (weight, length, head circumference) against international standards at birth
  • Assessing postnatal growth in preterm infants against a standard derived from a healthy, low-risk international population
  • Cross-checking a growth assessment against a second reference alongside Fenton or WHO charts
  • Research or audit contexts that specifically call for INTERGROWTH-21st referencing

3 Formula & method

PediAid does not recompute INTERGROWTH-21st centiles itself — tapping through opens Oxford's own manual-entry tool, which takes the infant's measurements and gestational age and returns the official INTERGROWTH-21st percentile.
  • INTERGROWTH-21st (University of Oxford)

4 Frequently asked questions

How is INTERGROWTH-21st different from the Fenton or WHO charts already in PediAid?

All three are growth references built from different cohorts and study designs. PediAid's Fenton and WHO charts are fully interactive in-app; INTERGROWTH-21st is linked directly to Oxford's own tool so the standard stays exactly as published.

Does PediAid calculate INTERGROWTH-21st percentiles itself?

No — it links straight to intergrowth21.ndog.ox.ac.uk's official manual-entry calculator.

When would I use INTERGROWTH-21st instead of Fenton?

Some units and research protocols specifically standardise on INTERGROWTH-21st; PediAid keeps a direct link available so you're not without it, alongside the Fenton and WHO tools built into the app.

5 Related tools

WHO Growth Chart Calculator

0 to 5 Years — Boys & Girls

IAP Growth Chart 2015

5 to 18 Years — Indian Reference

Fenton Growth Chart

22 to 50 Weeks PMA — SGA / AGA / LGA

Gestational Age & EDD Calculator

EDD, GA & Antenatal Dates
For qualified clinicians. This page and the PediAid app are a clinical aid only. Calculations and reference data must be verified against the patient's clinical context, the source guideline and your local protocols before any treatment decision is made.