📈 Growth Chart

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Baby Growth Chart & WHO Percentile Tracker

📌 What It Does

This infant growth tracker plots your baby's weight, height, and head circumference against WHO (World Health Organization) growth standards. It shows the 3rd, 50th, and 97th percentile curves as reference lines, so you can see where your child falls relative to global averages. The tool supports corrected age for preemies — a critical feature that most generic growth charts ignore, which can make premature babies appear failing when they're actually on track.

🔢 Understanding Percentiles

Percentiles are not grades. Being in the 15th percentile doesn't mean your baby is "15% healthy" — it means 15% of babies the same age are smaller, and 85% are bigger. What matters is the trend, not the single number:

• Consistent curve: Following roughly the same percentile over time = healthy growth pattern
• Crossing percentiles: Jumping up or down 2+ major percentile lines = talk to pediatrician
• Below 3rd or above 97th: May warrant additional evaluation, but not automatically a problem

The chart uses WHO reference data for boys 0-12 months (simplified for this tool). For preemies, we subtract weeks early from chronological age to calculate corrected age before plotting — this is standard NICU practice and prevents false alarms about "failure to thrive" in babies who are actually growing appropriately for their gestational age.

💡 Preemie Growth Note

Premature babies should be tracked on corrected age until at least 2 years old (some doctors say 3 years for very early preemies). A baby born at 32 weeks (8 weeks early) who is 6 months old chronologically is only ~4 months old corrected. Plotting them on the 6-month curve will make them look tiny — plotting on the 4-month curve shows their true progress. This tool handles that math automatically when you enable preemie mode.