Baby Growth Percentile Calculator
Estimate your baby's weight percentile based on age and gender using WHO growth chart approximations.
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Growth Percentile Estimate
Growth percentiles compare your baby’s weight to other babies of the same age and gender.
This calculator uses simplified WHO growth chart data to estimate a percentile range.
What percentiles mean:
- 50th percentile = average (half of babies weigh more, half less)
- 25th–75th = normal range
- 5th–95th = healthy range for most babies
- Below 5th or above 95th = discuss with pediatrician
Average weights (WHO):
| Age | Boys | Girls |
|---|---|---|
| Birth | 7.5 lb / 3.4 kg | 7.2 lb / 3.3 kg |
| 6 mo | 17.3 lb / 7.9 kg | 15.9 lb / 7.2 kg |
| 12 mo | 21.2 lb / 9.6 kg | 19.6 lb / 8.9 kg |
Disclaimer: This provides rough estimates only. Always consult your pediatrician for accurate growth tracking.