Enter your child's age and weight to see where they sit on WHO growth charts. For children aged 0–5 years.
Any percentile between the 3rd and 97th is generally considered within the normal range. The 50th percentile means your child weighs the same as the average child of the same age and sex — but there is nothing wrong with being above or below this.
What matters most is the trend. A child who consistently tracks along the 15th percentile is perfectly healthy. What your GP looks for is crossing of percentile lines — moving up or down 2 or more major lines over time, which may warrant further assessment.
A single measurement is a snapshot. Your child and maternal health nurse and GP track growth over multiple visits to see the pattern.
See your GP or child health nurse if:
Weight below 3rd percentile — may indicate failure to thrive or underlying condition
Weight above 97th percentile — may warrant assessment of feeding habits and activity
Crossing 2+ major percentile lines — either up or down over several months
Weight loss in a child — always worth investigating
Premature babies have adjusted percentiles — your GP or paediatrician will use corrected age until age 2.
This calculator uses the WHO Child Growth Standards (2006) weight-for-age data, which is the standard used by Australian child health services for children 0–5 years. The WHO standards describe how children should grow under optimal conditions.
The percentile is calculated using the LMS (Lambda-Mu-Sigma) method, which accounts for the skewed distribution of weight at each age. This is the same method used by your child's health record book (the "Blue Book" or "Red Book" depending on your state).