👶Child Growth Percentile (WHO)
Growth percentiles compare a child's height and weight to a reference population of the same age and sex. A child at the 50th percentile is exactly average; 10th percentile is shorter/lighter than 90% of peers; 90th percentile is taller/heavier than 90% of peers.
- 1WHO growth charts (0–5 years) and CDC charts (2–20 years) are the standard references
- 2Z-score = (measurement − median) / SD for age and sex
- 3Track trend over time — sustained crossing of centile lines is more significant than a single reading
Boy age 7 · height 120cm · weight 22kg=Height ~50th percentile · Weight ~50th percentileAverage for age and sex
| Percentile | Interpretation |
|---|---|
| < 3rd | Consider investigation if persistent |
| 3rd–15th | Below average — monitor |
| 15th–85th | Normal range |
| 85th–97th | Above average — monitor |
| > 97th | Consider investigation if persistent |
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Fun Fact
Children's average height has increased ~10 cm over the last 100 years in developed countries (secular trend), mainly due to improved nutrition and reduced childhood infection.
References
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