Child Growth, Weight & Nutrition
Growth tracking is one of the most powerful signals in pediatric care. A single height or weight tells you almost nothing — the trajectory across visits, plotted against WHO or CDC norms, is what matters.
Last reviewed: June 25, 2026
Calculators in this topic
Free, evidence-based tools — no signup, no data stored.
Plot your baby's weight and length against WHO Child Growth Standards. Get percentiles and z-scores instantly.
Calculate Body Mass Index for children and teens with CDC age- and sex-specific percentile interpretation.
Convert your baby's date of birth to exact age in years, months, weeks, and days. Perfect for milestones, vaccinations, and pediatric visits.
WHO vs CDC growth charts
The CDC recommends WHO standards from birth to 24 months and CDC charts from 2 to 20 years. WHO charts describe optimal growth in healthy, breastfed populations; CDC charts describe the U.S. reference population.
Reading pediatric BMI
Children's BMI is age- and sex-specific. The same numeric BMI means very different things at age 3 versus age 12, so always interpret as a percentile, not a raw number.
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