Growth, charted clearly
Weight, length and head circumference on WHO percentile curves, calculated on your device. Corrected age for babies born early, and a printable summary for the checkup.
- WHO percentile curves Weight, length and head circumference plotted on the official WHO growth standards, calculated on your device.
- Corrected age for preemies Born early? Plumi can measure growth from the due date instead, so percentiles are fair to premature babies up to age two.
- Doctor-ready summary The Baby Card sums up growth with percentiles, plus feeding, sleep and health history — printable as a tidy PDF for the checkup.
WHO percentiles, on your phone
Log a measurement and it lands on the curve — weight, length and head each on their own WHO chart, with the percentile bands behind and your baby's line drawn on top. No spreadsheet, no squinting at the paper chart from the clinic.
One card for the doctor's visit
Tap your baby's picture and the whole month is already summed up: growth with percentiles, feeding, sleep and diaper averages, the latest solids, allergies, medications and vaccines. Print it as a tidy PDF and hand it over at the checkup. Part of Plumi Pro.
Averages over 30 days · Generated by Plumi
Free to track. One subscription for the family.
Every tracking feature is free, forever, and you don't need an account to start. Plumi Pro adds sync, reminders and sharing — and one subscription covers everyone you invite: your partner, grandparents, the nanny — each with their own login and their own role.
- Free forever to track
- No account required
- End-to-end encrypted
Growth tracker questions
Is the growth tracker free?
Yes. Logging measurements and seeing them on WHO percentile charts is free forever, with no account needed. Plumi Pro adds sync, sharing and the printable Baby Card.
What growth charts does Plumi use?
The WHO Child Growth Standards — the charts most pediatricians use for babies and toddlers — for weight, length/height and head circumference. The curves show the 3rd–97th percentile bands with the median marked, and your baby’s measurements plotted on top.
What does a percentile actually mean?
A percentile compares your baby with other children of the same age and sex: at the 62nd percentile for weight, your baby weighs more than 62 of 100 peers. There is no “good” percentile — pediatricians care about the trend along a curve, not the number itself. If you’re curious right now, try our free growth percentile calculator.
My baby was born early — are the charts fair to them?
That’s what corrected age is for: measuring from the due date instead of the birth date, so a baby born 8 weeks early isn’t compared against full-term peers. Enter the gestational age at birth and Plumi corrects the percentile charts automatically, phasing it out by age two. There’s also a free corrected age calculator.
How often should I weigh and measure my baby?
For a healthy baby, the measurements from regular checkups are usually plenty — growth is judged over months, not days. Log the numbers from each visit and the chart builds itself. Daily weighing tends to create worry, not insight; if you have concerns about growth, talk to your pediatrician.
Can I show the chart to my pediatrician?
Better — hand them the Baby Card: a printable summary with growth and percentiles, 30-day feeding, sleep and diaper averages, latest solids, allergies, medications and vaccines, as a tidy A4 or US Letter PDF. You can also export your full history as CSV anytime.
Are measurements in metric or imperial?
Either — Plumi shows kg and cm or lb and in following your preference, with both displayed side by side on measurements.
Can grandparents follow along?
Yes. With Plumi Pro you can share each child with up to 5 people — partner, grandparents, the nanny — each with their own login, and one subscription covers everyone. It’s all end-to-end encrypted.
Watch them grow, clearly.
Growth charts are free forever. Plumi Pro adds the printable Baby Card, sync and sharing.