Ausclin · Free Nutrition Tools
Plot your child’s growth on the WHO chart
A free, private growth-chart generator from our Accredited Practising Dietitians in Newcastle & Lake Macquarie. Enter your child’s age, weight and length to see their WHO percentiles and z-scores, and a plain-language read on what they mean.
“Is my baby growing okay?” is one of the most common questions new parents ask, and one of the easiest to worry about. Growth charts are how health professionals answer it: they compare your child’s measurements against the World Health Organization Child Growth Standards, the international reference for how healthy, well-nourished children grow. This tool plots your child (birth to 24 months) on those same standards, showing their percentile and z-score for weight-for-age and length/height-for-age. It’s an educational snapshot, not a diagnosis, and it works best as a starting point for a conversation with your child health nurse, GP or paediatrician.
How to measure at home (and when to get it done properly)
- Weight, babies are most accurately weighed undressed on baby scales. Home scales are fine for a rough check; your child health nurse has calibrated ones.
- Length (under 2) is measured lying down; height is standing. Length is genuinely hard to measure accurately at home, a small error moves the percentile a lot, so treat home figures as approximate.
- Age, enter age in months (you can use half-months, e.g. 9.5).
For anything you’re basing decisions on, use measurements taken by your child health nurse, GP or paediatrician.
Generate your child’s growth chart
Weight-for-age
Z-score: Percentile:
Length/height-for-age
Z-score: Percentile:
Book a paediatric nutrition consult
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WHO Child Growth Standards (birth to 24 months), WHO Multicentre Growth Reference Study, 2006.
Clinical-grade. Private by design.
Built by Accredited Practising Dietitians, and every calculation runs privately in your browser.
What a percentile actually means
A percentile simply tells you how your child compares with other children of the same age and sex. If your child is on the 50th percentile for weight, they’re right in the middle, half of children weigh more, half weigh less. The 25th percentile means about 25% weigh less and 75% weigh more. There is no single “right” percentile: healthy children come in a wide range of shapes and sizes. A baby tracking steadily along the 15th percentile is usually just as healthy as one on the 85th.
A z-score is the same idea expressed as a number: 0 is the median, and most healthy children fall between −2 and +2. It’s the measure clinicians tend to use because it stays precise even out at the edges of the chart.
Why the trend matters more than any single point
The most useful thing a growth chart shows isn’t one measurement, it’s the pattern over time. Children generally grow along a fairly consistent percentile band. A one-off reading that looks high or low is rarely meaningful on its own; what health professionals watch for is a steady trend, and any sustained change in direction (for example, dropping across two or more percentile bands). That’s why this tool shows where your child sits today, but always encourages you to interpret it alongside their history and your health team.
Frequently asked questions
Which growth standard does this use?
The World Health Organization Child Growth Standards for children from birth to 24 months (the LMS reference values published for weight-for-age and length/height-for-age). These describe how healthy, well-nourished children grow and are the standard used across Australian child health services.
My child is on a low (or high) percentile, should I worry?
Not on its own. Percentiles span a wide healthy range, and a single measurement rarely tells the full story, what matters is the trend over time and your child’s overall wellbeing, development and feeding. Use this result as a prompt to check in with your child health nurse or GP rather than as a diagnosis. This tool never diagnoses anything.
Why can I enter weight or length, or both?
Because you might only have one to hand. The tool will chart whichever measurements you enter. Entering both gives a fuller picture, weight and length are most informative when read together, which is also how your health professional will look at them.
Is this the same as a BMI or weight-for-length chart?
No. This tool charts weight-for-age and length/height-for-age (birth–24 months). Weight-for-length and BMI-for-age are separate assessments your health professional may use as your child grows. We’ve kept this tool focused on the two most familiar early-childhood charts.
Is my child’s data private?
Yes. Everything is calculated in your browser, your child’s age, weight and length are never sent anywhere or stored against you. We only record anonymous, aggregate usage (like how many charts were generated) to improve the tool, with no personal or health details attached.
Can Ausclin help with my child’s nutrition?
Yes. Our Accredited Practising Dietitians support infant and child feeding, fussy eating, growth concerns and family nutrition. If you’d like tailored guidance, you can book an appointment or explore our pregnancy & postpartum support.