Track your
baby's growth
with confidence
Calculate weight, height, and head circumference percentiles using WHO standards. Visualize growth curves and predict adult height.
WHO Percentiles
WHO Standards 2006
Growth Curves
Interactive charts
Height Predictor
Estimated adult height
Reference Table
Average sizes by age
Percentile Calculator
Enter your baby's data to find out their percentile according to WHO growth standards.
Growth Curves
View WHO standard growth curves with P3, P15, P50, P85, and P97 percentile lines.
Weight for age
WHO (0-5) — Boys
Adult Height Predictor
Estimate your child's adult height based on both parents' heights using the mid-parental height method.
Adult Height Predictor
Mid-parental height method (Tanner)
Average Size Reference Table
Check average weight, height, and head circumference values by age according to WHO standards.
Average Size Reference Table
P50 — WHO
| Age | Weight (lb) ♂ | Height (in) ♂ | Head Circ. (in) ♂ | Weight (lb) ♀ | Height (in) ♀ | Head Circ. (in) ♀ |
|---|---|---|---|---|---|---|
| Birth | 7.3 | 19.6 | 13.6 | 7.1 | 19.3 | 13.3 |
| 1 month | 9.9 | 21.5 | 14.7 | 9.3 | 21.1 | 14.4 |
| 2 months | 12.3 | 23.0 | 15.4 | 11.2 | 22.5 | 15.1 |
| 3 months | 14.1 | 24.2 | 15.9 | 12.8 | 23.5 | 15.6 |
| 4 months | 15.4 | 25.2 | 16.4 | 14.1 | 24.4 | 16.0 |
| 5 months | 16.5 | 25.9 | 16.8 | 15.2 | 25.2 | 16.3 |
| 6 months | 17.4 | 26.6 | 17.0 | 16.1 | 25.9 | 16.6 |
| 9 months | 19.6 | 28.3 | 17.7 | 18.1 | 27.6 | 17.2 |
| 1 year | 21.2 | 29.8 | 18.1 | 19.6 | 29.1 | 17.7 |
| 1 year 6 months | 24.0 | 32.5 | 18.7 | 22.5 | 31.8 | 18.2 |
| 2 years | 26.9 | 34.6 | 19.0 | 25.1 | 33.9 | 18.5 |
| 3 years | 31.7 | 38.1 | 19.4 | 30.4 | 37.5 | 18.8 |
| 4 years | 36.6 | 41.1 | 19.6 | 35.7 | 40.5 | 19.0 |
| 5 years | 41.7 | 43.7 | 19.8 | 41.0 | 43.1 | 19.1 |
Source: WHO Child Growth Standards (2006)
Everything About Your Baby's Growth
What are growth percentiles?
Growth percentiles are a statistical tool that compares your baby's measurements with those of other children of the same age and gender. A 50th percentile means your baby is exactly at the median: 50% of children weigh more and 50% weigh less. WHO standards are based on data from healthy children worldwide and are the most widely used international reference.
How to interpret WHO growth curves?
Growth curves show the normal range of development. What matters most is not a single value, but the trend over time. A baby consistently following the 25th percentile is growing healthily. What concerns pediatricians is a sudden change in percentile, such as dropping from P75 to P25 in a short time. Always consult your pediatrician for a complete evaluation.
How does the adult height predictor work?
The predictor uses the mid-parental height method, also known as the Tanner method. For boys, it's calculated as (father's height + mother's height + 13 cm) / 2, and for girls as (father's height + mother's height - 13 cm) / 2. This method has an error margin of approximately ±8.5 cm, as factors like nutrition, exercise, and overall health also influence final height.
When should I worry about my baby's growth?
You should consult your pediatrician if: your baby's percentile is below P3 or above P97, if there's a significant change in the growth curve (crossing two percentile lines), if the baby doesn't gain weight for several consecutive weeks, or if you notice any change that concerns you. Remember that this tool is informational and does not replace professional medical evaluation.