Baby Growth & Percentile Calculator

Free baby growth calculator. Enter your baby's age, weight, and height to find their growth percentile based on WHO child growth standards. Use our free calcula

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Understanding Baby Growth Percentiles

A growth percentile indicates how your baby's measurements compare to a reference population of the same age and sex. A baby at the 50th percentile for weight is heavier than 50% of babies of the same age and sex — perfectly average. The 10th or 90th percentile are not "bad" — they simply indicate your baby is smaller or larger than most.

WHO vs CDC Growth Charts

  • WHO (0–5 years): Based on healthy breastfed infants in 6 countries. Considered the international gold standard for infants. This calculator uses WHO data.
  • CDC (2–20 years): Based on US population data, preferred by many US pediatricians for children over 2.

What Percentiles Mean

PercentileMeaning
3rd–5thVery small — pediatrician review recommended
5th–15thSmaller than average — monitoring advisable
25th–75thAverage range
85th–95thLarger than average
Above 95thVery large — pediatrician review recommended

What Matters Most: Growth Trend

A single percentile measurement means less than the trend over time. A baby consistently at the 20th percentile is developing normally. A baby that drops from the 70th to the 20th percentile over a few months warrants medical attention — regardless of the absolute value.

Factors Affecting Growth

  • Genetics (parental height and build)
  • Nutrition and feeding method
  • Gestational age at birth (premature babies use corrected age)
  • Health conditions and medications

How to Use This Calculator

Using our calculator is simple: enter the required values into the input fields and click the calculate button. Results are displayed instantly on screen. You can adjust the values and recalculate to compare different scenarios and find the best option for your situation.

Frequently Asked Questions

QuestionAnswer
How accurate are the results?We use standard formulas and up-to-date 2025 rates. Individual circumstances may vary slightly.
Is this calculator free?Yes, completely free and no registration required.
What should I do for exact figures?For precise information, consult a relevant professional or official authority.
Does it work on mobile devices?Yes, it works seamlessly on all devices and screen sizes.

Important Notes

This calculator is provided for informational purposes only. For legal, financial, or medical decisions, always seek advice from qualified professionals. Calculation results do not constitute official documents. Legislative changes may affect results; please visit the relevant official website for the most up-to-date information. Our calculators are regularly updated to reflect current regulations and rates.

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Frequently Asked Questions

A 50th percentile weight means the child weighs more than 50% of children of the same age and sex. Anything between 5th-95th percentile is generally considered normal.
No — 50% of children are below the 50th percentile by definition. What matters is consistent growth along a curve, not the specific percentile number.
Consult a pediatrician if your baby drops two or more major percentile lines, consistently stays below the 3rd percentile, or shows sudden unexpected weight loss.