Baby growth charts with WHO and CDC percentiles
Every measurement plotted on the right chart, with its percentile — and a gentle flag when the line changes course. Context for the conversation, never a diagnosis.
Cocoon plots weight, length or height, head circumference, BMI and weight-for-length on WHO growth standards from birth to 2 years and CDC charts after that, and shows a percentile for every measurement. It corrects for prematurity automatically, flags when a line crosses two centile bands, and works in kg, lb and oz, cm or inches.
What it does
Add a measurement and Cocoon plots it on the right reference: WHO growth standards for 0–24 months and CDC charts from 2 years, following the AAP's guidance. Each measurement gets its percentile, with the typical range and median drawn behind your baby's line.
Born early? Cocoon uses corrected age everywhere — growth, milestones, forecasts and the sleep program — so a premature baby is compared fairly.
If the line crosses two centile bands, Cocoon points it out gently as something to mention at the next check — never as a diagnosis. Growth charts drop straight into the checkup report for your GP or child-health nurse.
How it works
- Open Care → Growth and tap + to add a measurement.
- Enter weight, length or head — in metric or imperial.
- Read the percentile and see the line on the chart.
- Turn it into a checkup report for the doctor.
The details
- Weight, length/height, head circumference, BMI, weight-for-length
- WHO 0–24 months, CDC from 24 months
- Corrected age for premature babies
- kg or lb + oz, cm or inches
- Percentile-crossing flag, framed as context
- Growth charts with percentile curves in the checkup PDF
Common questions
Which growth charts does Cocoon use?
WHO Child Growth Standards from birth to 24 months and CDC charts from 24 months, in every region, following AAP guidance.
Does Cocoon adjust for premature babies?
Yes. Enter the due date and Cocoon uses corrected age for growth percentiles, milestones, forecasts and the sleep program.
Can I use pounds and inches?
Yes. Growth works in kg or lb and oz, and cm or inches — set once in Settings → Appearance & units.
Read more in the guides
Baby growth spurts: signs and what to expect
When baby growth spurts tend to happen, how to spot one, and why the extra feeding and broken sleep usually pass within a few days.
Is my baby getting enough milk?
If your baby is having regular wet and dirty nappies, gaining weight and settling after most feeds, the milk is very likely going in just fine.
How much formula does my baby need?
There's no perfect number — your baby's hunger cues, wet nappies and steady growth tell the real story, and we'll help you read them.
Milestones: 0–3 months
In these first weeks your baby is learning to find your face, lift their head and share that first real smile — and there's a wide, healthy range for all of it.
Free tools
Growth charts & percentiles
Every feature is free right now — no ads, no subscription. Log feeds, sleep and nappies in seconds — and keep the memories too.
Goes well with
Checkup report & PDF summaries
Everything the doctor asks about, on a few clear pages — plus the questions you meant to ask, so none get forgotten in the room.
How it worksMilestones & development
Milestones as ranges, not deadlines: the CDC checklist, a gentle “This week” card on Home, and every first saved to the journal.
How it worksMedicine, temperature & health log
When did the last dose go in? Cocoon knows — and warns you before an early one. Temperatures, symptoms, vaccines, teeth and visits, all in one place.
How it works