1. What Are Growth Percentiles?

Growth percentiles show how a child's measurements compare to others of the same age and gender. A child in the 75th percentile for weight is heavier than 75% of children their age.

2. How Percentiles Are Calculated

Percentiles are calculated using standardized growth charts:

Where:

• \( Age \) — Child's age in years (including fractions for months)
• \( Weight \) — Measured weight in kilograms
• \( Height \) — Measured height in centimeters
• \( Gender \) — Biological sex (different charts for boys/girls)

Explanation: The calculator compares inputs to CDC or WHO growth chart data to determine percentiles.

3. Importance of Growth Tracking

Details: Regular growth monitoring helps identify potential health issues. Consistent extreme percentiles or sudden changes may warrant medical evaluation.

4. Using the Calculator

Tips: Enter accurate measurements taken without shoes/heavy clothing. Age should include months (e.g., 2.5 for 2 years 6 months).

5. Frequently Asked Questions (FAQ)

Q1: What's a "normal" percentile?
A: Typically 5th-95th percentiles are considered normal, but patterns over time matter more than single measurements.

Q2: How often should measurements be taken?
A: Monthly for infants, every 3-6 months for toddlers, annually for older children unless concerns exist.

Q3: Which growth charts are used?
A: WHO charts for 0-2 years, CDC charts for 2+ years in most cases.

Q4: What if height and weight percentiles differ greatly?
A: Consult a pediatrician if percentiles differ by more than 25 points consistently.

Q5: Are percentiles different for premature babies?
A: Yes, use adjusted age (chronological age minus weeks premature) until age 2.