TOOL
Baby Growth Chart
Wondering if your baby's on track? Plug in their measurements and see for yourself.
Supports both WHO and Fenton growth charts — totally free, and your data stays right here in your browser.
Optional — lets us calculate age from checkup dates.
Plotted on WHO Child Growth Standards
For term babies, 0–60 months
What This Tool Does
This free growth chart plotter lets you enter your baby's weight, length, or head circumference and see exactly where they fall on standard percentile curves. It supports both WHO growth charts (for full-term infants) and Fenton growth charts (for premature babies). All calculations happen in your browser — no data is stored or sent anywhere. For a dedicated preemie tool, try our Fenton growth chart plotter.
Understanding Percentiles
Growth percentiles are not grades. A baby at the 20th percentile is not “failing” and a baby at the 90th percentile is not “winning.” Percentiles simply show where your baby falls relative to a reference population. What matters most is that your baby follows a consistent curve over time — their own growth trajectory.
A single measurement tells you very little. Pediatricians look at the pattern across multiple visits. If your baby has always tracked along the 25th percentile, that's their normal. A sudden jump or drop across percentile lines is more meaningful than the percentile number itself. For a deeper dive, see our guides on baby growth percentiles and growth tracking.
Frequently Asked Questions
What is a baby growth percentile?
A growth percentile compares your baby's measurement — weight, length, or head circumference — to other babies of the same age and sex. For example, the 40th percentile means your baby is larger than 40% of babies and smaller than 60%. Percentiles describe where your baby falls on the growth curve, not whether they're healthy or unhealthy. Pediatricians look at the trend over time, not a single data point.
How often should I plot my baby's growth?
Most pediatricians measure at every well-child visit — roughly at 1, 2, 4, 6, 9, and 12 months in the first year. Plotting at those intervals is usually sufficient. Measuring too frequently (weekly, for example) can cause unnecessary anxiety because normal day-to-day fluctuations in weight can look like drops or jumps that aren't clinically significant.
What's the difference between WHO and Fenton growth charts?
WHO growth charts are designed for full-term babies and are the standard in most countries for children 0–2 years. They're based on breastfed infants as the norm. Fenton growth charts are designed specifically for premature babies (born before 37 weeks) and cover 22 weeks gestational age through 50 weeks post-menstrual age, connecting to WHO charts at term. If your baby was born preterm, your pediatrician will likely use Fenton charts until corrected age catches up.
Should I worry if my baby is in a low percentile?
Not necessarily. A baby consistently tracking along the 10th percentile is growing predictably — that's their curve, and it's perfectly normal. What matters more is the trend: a sudden drop across two or more percentile lines (e.g., from the 50th to the 15th) may warrant evaluation. Some babies are genetically smaller or larger, and the percentile itself isn't a grade. Talk to your pediatrician if the trajectory changes, not just because the number seems low.
When should I talk to my pediatrician about growth?
Bring it up if your baby's weight, length, or head circumference crosses two or more major percentile lines (up or down) over consecutive visits, if weight gain stalls for more than two weeks in a newborn, or if your baby falls below the 3rd or above the 97th percentile. Also consult if there's a mismatch between weight and length percentiles (e.g., weight dropping while length stays the same). Your pediatrician can assess whether the pattern is a normal variant or needs investigation.
