Baby Growth
Percentile Calculator
Track your baby growth against WHO standards. This free calculator shows weight and length percentiles to help monitor infant development milestones.
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How This Baby Growth Works
Enter your baby age, gender, weight, and length. The calculator compares these measurements against WHO growth standards to determine percentiles. A 50th percentile means your baby is average for their age. Higher percentiles indicate larger than average, lower indicates smaller.
When Should You Use This Tool
Use this calculator between pediatrician visits to track growth trends. Measure baby on a flat surface for length. Weigh without clothes for accuracy. Tracking trends over time is more meaningful than any single measurement.
Is This Tool Accurate and Safe
This calculator provides estimates based on WHO international growth standards. Individual healthy babies vary widely. Percentile alone does not indicate health problems. Consistent growth along any percentile curve is generally healthy. Always discuss concerns with your pediatrician. All data stays private.
Frequently Asked Questions
What is a normal growth percentile for babies?
Any percentile from 5th to 95th is typically considered normal. What matters most is that your baby follows their own growth curve consistently over time rather than jumping between percentiles.
Why is my baby's weight percentile different from length?
It is normal for babies to have different weight and length percentiles. Some babies are long and lean, others are shorter and heavier. Both patterns can be healthy if consistent with the baby's own growth pattern.
When should I worry about baby growth percentiles?
Discuss with your pediatrician if your baby drops or gains more than two percentile lines between checkups, falls below the 3rd percentile, or shows inconsistent growth patterns. Single measurements rarely indicate problems.
How often should I track baby growth?
Pediatricians typically measure at well-baby visits: 1, 2, 4, 6, 9, 12, 15, 18, and 24 months. More frequent home tracking is optional but can help identify trends between visits.