Baby Growth Calculator – WHO Percentiles (0-36 Months)
Weight Percentile
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Length/Height Percentile
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Head Circumference Percentile
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Understanding Baby Growth Percentiles
Growth percentiles compare your baby's measurements to the World Health Organization (WHO) growth standards, which are based on data from healthy children in six countries. A percentile indicates what percentage of children of the same age and sex have the same or lower measurement.
The three key measurements tracked are weight, length (or height after age 2), and head circumference. Weight-for-age shows overall growth, length-for-age indicates skeletal growth, and head circumference reflects brain development. Pediatricians plot these on growth charts at each visit.
The most important factor is consistent growth along a percentile curve over time, not the specific percentile number. A baby who consistently tracks along the 25th percentile is growing normally. Sudden changes may need evaluation. This calculator uses simplified WHO LMS data to estimate percentiles.
Frequently Asked Questions
What are WHO growth percentiles?
WHO growth percentiles show how a child's measurements compare to other children of the same age and sex worldwide. The WHO standards are based on healthy breastfed children from six countries.
What is considered a normal growth percentile?
Any percentile between the 3rd and 97th is generally considered within the normal range. What matters most is consistent growth along a percentile curve over time, not a single measurement.
How often should I track my baby's growth?
Pediatricians typically measure growth at every well-child visit. Between visits, monthly measurements at home can help track trends.
Do breastfed and formula-fed babies grow differently?
Yes. Breastfed babies tend to grow faster in the first 3-4 months and then slower from 4-12 months compared to formula-fed babies. The WHO standards are based on breastfed children.