👶 Baby Growth Percentile Calculator
Calculate weight-for-age, length-for-age, and weight-for-length percentiles for babies aged 0–24 months using WHO growth standards.
Understanding Percentiles
What it means
A child at the 50th percentile is heavier/taller than 50% of children the same age and gender. Being at the 25th percentile does not mean the child is underweight — it means they are smaller than average, which may be perfectly normal.
When to seek advice
Consult your paediatrician if your child is below the 3rd or above the 97th percentile, or if growth crosses two major percentile lines between visits. The trend over time matters more than a single measurement.
Frequently Asked Questions
The WHO Multicentre Growth Reference Study (MGRS) established growth standards for children 0–5 years in six countries. They describe how children should grow under optimal conditions (breastfed, non-smoking households, healthy environments), not just how they typically grow.
Not necessarily. A child consistently at the 10th percentile is likely growing normally for their genetic potential. Red flags are rapid drops across percentile lines, being below the 3rd percentile, or clinical signs of malnutrition or illness.
Weight-for-length (WFL) compares a child's weight to other children of the same length, regardless of age. A high WFL (above 97th percentile) may indicate overweight/obesity risk; low WFL may indicate wasting (malnutrition).
Health authorities typically recommend growth measurements at birth, 1 week, 2 weeks, 1 month, 2 months, 4 months, 6 months, 9 months, 12 months, 15 months, 18 months, 24 months, and then annually.
Boys and girls have different average sizes and growth patterns from birth. Using gender-specific charts ensures more accurate comparisons. The differences are small in infancy but become more pronounced during puberty.
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