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Baby Growth Calculator

Calculate your child's height weight and head circumference percentile based on WHO Growth Standards (2006).
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What is the Baby Growth Calculator?

A calculator that takes your child's birth date, sex, height, weight, and head circumference to compute growth percentiles compared to peers. It applies WHO Growth Standards for children under 36 months and the 2017 Korean Pediatric Growth Chart for those 36 months and older. It uses exact age in days rather than simple months for more precise results.

Growth Standard Application

For children under 36 months the WHO Growth Standards are applied. These standards are based on an ideal growth model including breastfed infants and are the most widely used international reference.

For children 36 months and older the 2017 Korean Pediatric Growth Chart is used. This fully reflects the data used as the standard by Korea's CDC and pediatric clinics.

How to Interpret Percentile Results

Percentile shows where your child ranks among 100 children of the same age and sex.

Percentile RangeInterpretationAction
Above 97%Overgrowth or obesity concernFurther evaluation recommended
85–97%Larger than peersPeriodic monitoring needed
15–85%Normal rangeNormal development
Below 3%Growth delay concernSpecialist consultation needed

What matters more than a single number is the rate of growth. Even a low percentile is considered healthy if the child consistently grows along their own curve. If percentile shifts by two or more bands across two measurements, consult a pediatrician.

Recommended For

  • Before check-ups: When you want to check your child's growth percentile before a pediatric visit
  • Growth tracking: When monitoring your child's growth pattern over time
  • Preemie parents: When evaluating premature baby growth using corrected age
  • Peer comparison: When curious about how your child's height and weight compare to peers
  • Growth spurt check: When wondering if your child is in a rapid growth phase

Frequently Asked Questions

Very accurate. The calculator uses your child's exact age in days from their birth date before comparing with the growth chart, giving much more precise results than simple month-based comparisons.

Premature babies should use corrected age calculated from the expected due date rather than the actual birth date. Corrected age is typically applied until 24 months of age.

Not necessarily. Anything within the 3rd to 97th percentile is normal. What matters is whether the child is growing consistently along their own curve. Consult a pediatrician if there are sudden percentile shifts.

A period when your child eats much more, sleeps more, and grows rapidly. It typically occurs around 3 weeks, 6 weeks, 3 months, and 6 months of age. Temporary fussiness and increased feeding are normal.

Yes. Head circumference up to age 2 is an important indicator of brain development. If it is significantly smaller or larger than peers, additional testing may be needed. Always have it measured during regular check-ups.