How to Check Your Baby's Growth Percentile
An infant growth percentile shows where your baby's height and weight fall compared to other babies of the same age and sex. This calculator uses age-based averages and standard deviations from WHO/CDC growth references to estimate a percentile, giving you a quick sense of whether your baby is tracking along a typical growth curve.
Understanding percentiles
The 50th percentile represents the average for that age group, and the 3rd-97th percentile range is generally considered normal. A low or high percentile by itself isn't automatically a concern — what matters more is whether your baby's growth curve stays consistent over time. A sudden jump or drop in percentile is a good reason to check in with your pediatrician.
Remember this is a reference tool
This calculator uses representative values at fixed age points, so it's an approximation and may differ slightly from the precise WHO/CDC growth charts your doctor uses. Use it alongside official charts reviewed at well-baby visits, and always confirm any concerns with your pediatrician.
Frequently Asked Questions
No — this is an approximation for reference only. Your pediatrician uses precise WHO/CDC growth charts plus your baby's growth history for an accurate assessment.
Not necessarily. The 3rd-97th percentile range is generally considered normal, and a steady growth trend matters more than a single percentile. Talk to a pediatrician if you notice a sudden shift.