Baby Growth Calculator
Compare your baby's weight and height to WHO growth chart medians. See where your baby falls and track growth over time.
Part of our Health Calculators collection.
Baby Growth Calculator
Free online calculator
How to Use This Calculator
- 1
Enter baby's age, sex, weight, and length.
- 2
See how measurements compare to WHO median.
WHO Growth Reference
Compared against WHO Child Growth Standards (2006). Median weight/height by age and sex. Above 85th percentile, Near 50th, or Below 15th shown. More important than percentile: consistent growth trajectory.
Example Calculation
Example: 6-month boy, 16 lbs, 26 inches
Inputs
ageMonths: 6sex: maleweightLbs: 16heightIn: 26
Result
Near 50th percentile for weight and height
WHO median at 6 months male: ~16.1 lbs, 27 inches.
Frequently Asked Questions
What percentile should my baby be?
Any percentile from 5th to 95th is considered normal. The key is consistent growth along a similar curve over time. A baby who is always at the 20th percentile is growing normally.
My baby dropped a percentile — is that concerning?
Some variation is normal. A drop of 1–2 percentile lines over time warrants a conversation with your pediatrician, especially if accompanied by feeding difficulties.