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WHO and CDC growth charts
Plot every measurement on the WHO standard (birth to 5 years) or the CDC infant charts, with the 3rd to 97th percentile curves.
Check a measurement right now
Find your baby’s weight, length or head circumference percentile on the WHO or CDC chart. No account needed.
Open the percentile calculatorEverything you need to follow their growth
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Percentile and z-score for every entry
See exactly where each weight, length and head measurement falls, and how it moves between checkups.
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All your children in one place
Keep a separate profile and measurement history for each child.
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Fast entry
Type “7.5 kg and 67 cm yesterday” and Growthling fills in the form. You can also import past measurements from a spreadsheet.
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Share with your partner
Invite a partner or caregiver to follow the same child, and export a chart image to bring to the pediatrician.
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Works on any phone
Install it to your home screen on iPhone or Android. Available in English and Portuguese.
How it works
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Add your child
Name, sex and date of birth. Add as many children as you like.
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Log measurements
Enter weight, length and head circumference from each checkup or from home.
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See the curve
Growthling plots each one on the growth chart and shows its percentile, so you can follow the trend.
Guides for parents
All articlesUnderstanding Growth Percentiles
What a baby’s percentile really means, what range is normal, and when a change is worth a call to the pediatrician.
WHO vs CDC Growth Charts
Where the two charts come from, how they differ, and which one fits your child’s age.
Growth Spurts: What to Expect
When babies tend to have growth spurts, what they look like, how much babies grow each week, and when to call the doctor.
How Often Should You Measure?
How often babies are weighed and measured at checkups, and how to track at home without obsessing.
Why Head Circumference Matters
What your baby’s head measurement tells the doctor, how fast it grows, and how to measure it at home.
Feeding in the First Year
Milk only, first foods, iron, allergens and what to avoid: a month-by-month guide to feeding a baby in the first year.
Motor Milestones by Age
When babies usually hold their head up, roll, sit, crawl, stand and walk, with the normal age ranges from WHO and CDC.
Sleep & Growth Connection
How much sleep babies need at each age, how sleep and growth hormone are linked, and the basics of safe sleep.
Questions parents ask
Is Growthling free?
Yes. Signing up and tracking your children’s measurements is free.
Which growth charts does Growthling use?
The WHO Child Growth Standards (birth to 5 years) and the CDC infant growth charts (birth to 36 months). The CDC recommends the WHO charts for children under 2 in the United States; you can switch between them in the app.
What can I track?
Weight, length or height, and head circumference, for as many children as you want. Each measurement shows its percentile and z-score, and the full history is plotted on the chart.
Can I share my child’s chart?
Yes. You can invite a partner or caregiver to follow the same child, and export the growth chart as an image to share or bring to appointments.
Does Growthling tell me if something is wrong?
No. Growthling shows where measurements fall on reference charts and does not diagnose anything. Talk to your pediatrician about your child’s growth.
Is my data private?
We do not sell, rent or share your personal data, and we do not track you with advertising cookies. You can ask us to delete your account and all its data at any time.
Start your growth record today
Free to sign up. Works on any phone and installs to your home screen.
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