Baby Growth Percentile Calculator

A percentile of 50 means your baby weighs more than 50% of babies the same age and sex. The 25th–75th percentile range is considered typical. However, any consistent growth curve — even at the 10th percentile — is healthy. It's about consistent growth, not hitting a specific number.

Talk to your pediatrician if: your baby drops 2+ percentile channels (e.g., from 50th to 15th), is below the 3rd percentile, shows a sudden change in growth rate, or isn't gaining weight. A single measurement is less important than the growth trend over multiple checkups.

This calculator uses WHO (World Health Organization) growth standards, which are based on healthy breastfed babies as the norm and are recommended for children 0–2 years by the American Academy of Pediatrics. The CDC charts are used for children 2+ years.