Baby Boy Growth Percentile Calculator
Check your son's weight and height percentile against male-specific WHO and CDC growth curves — accurate from birth through age 5.
Infant Growth Percentile Calculator.
Enter your baby's measurements and location to see percentiles on the most appropriate growth chart for your region — with interactive curves, growth spurt indicators, and a printable report.
Weight-for-age
Height-for-age
What do these numbers mean?
Multi-child dashboard.
No saved measurements yet
Calculate your baby's percentiles above, then click "Save to Dashboard" to track growth over time.
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Why sex-specific charts matter
Baby boys and girls follow measurably different average growth trajectories from birth. On the WHO and CDC references, boys tend to track slightly higher on both weight-for-age and length-for-age curves at every month of age. Plotting a baby boy against a female or unisex curve can produce a misleading percentile — this calculator always uses the male-specific WHO or CDC reference for weight and height.
What a healthy result looks like
Any percentile between 3rd and 97th is within the typical healthy range for baby boys. A boy who has consistently tracked around the 25th percentile is generally just as healthy as one at the 75th — what pediatricians watch for is a sudden, sustained shift across percentile lines, not the absolute number.