Enter your baby's sex, age in months, weight, length/height, and head circumference to see where your child falls on the WHO growth percentile charts. You'll get percentile rankings for weight-for-age, length-for-age, and head circumference-for-age — helping you track whether your baby is growing steadily over time.
Weight Percentile
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Length / Height Percentile
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Head Circumference Percentile
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Weight Status
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Weight-for-Length Percentile
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A percentile tells you how your baby's measurement compares to a reference population of babies the same age and sex. For example, a weight at the 60th percentile means your baby weighs more than 60% of babies the same age. Percentiles don't indicate good or bad — they show where your baby falls in the range of typical growth.
At birth, the average baby weighs about 3.4 kg (7.5 lbs) and measures around 50 cm (19.7 in). By 6 months, most babies weigh roughly 7–8 kg and measure 65–68 cm. By 12 months, the average is about 9–10 kg and 74–76 cm. These are medians — healthy babies vary widely around these values.
Not necessarily. Being in the 10th or 90th percentile is not inherently concerning — what matters most is consistent, steady growth over time. If your baby's percentile drops significantly across multiple measurements or falls below the 3rd percentile, discuss it with your pediatrician.
This calculator uses WHO (World Health Organization) Growth Standards, which are recommended for children ages 0 to 2 years. WHO charts are based on children raised in optimal conditions and represent how children should grow, not just how they do grow.
Pediatricians typically measure weight, length, and head circumference at every well-child visit — usually at birth, 1, 2, 4, 6, 9, 12, 18, and 24 months. Tracking multiple data points over time is far more informative than any single measurement.
Head circumference reflects brain growth and development. A head that grows too slowly or too rapidly can signal neurological issues. Like weight and length, a single reading matters less than the growth trend across multiple measurements.
Weight-for-length percentile shows whether your baby's weight is proportionate to their length, regardless of age. It's a useful indicator of nutrition status — a very high weight-for-length can suggest overweight, while a very low value may indicate undernutrition. It's most relevant for infants under 2 years.
For premature babies, you should use their corrected age (subtract the number of weeks premature from their chronological age) when plotting on standard growth charts. Many pediatricians use corrected age until 24–36 months of age for premature infants.