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Health & growth

Baby milestone tracker with the CDC checklist

Milestones as ranges, not deadlines: the CDC checklist, a gentle “This week” card on Home, and every first saved to the journal.

In short

Cocoon includes the CDC “Learn the Signs. Act Early.” milestone checklist — 50 milestones at 12 ages from 2 months to 5 years, across social, language, thinking and movement. A “This week” development card on Home uses corrected age for premature babies, and ticked milestones sit in the journal beside the photo.

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Growth your doctor can read: a weight chart on the WHO reference showing the 51st percentile, the typical range band and median line, and a link to turn it into a checkup report for the doctor.

What it does

The milestone checklist follows the CDC's 2022 “Learn the Signs. Act Early.” list: 50 milestones at 12 ages from 2 months to 5 years, across social and emotional, language, thinking and movement.

A “This week” development card on Home shows what's typical around now — using corrected age for premature babies — and can mention developmental “leaps”, clearly labelled as a popular framework rather than a prediction.

Tick a milestone and it's saved with the date, and can carry a photo in the journal. Milestones also appear in the checkup report and the weekly digest.

How it works

  1. Open Care → Milestones & development for the checklist at your baby's age.
  2. Tick milestones as they happen; add a photo or note.
  3. Glance at the This week card on Home.
  4. Bring the list to your next check-up in the checkup report.

The details

  • CDC 2022 checklist: 50 milestones, 12 ages, 2 months to 5 years
  • Corrected age for premature babies
  • “This week” card on Home
  • Milestones in the journal, the weekly digest and the checkup report

Common questions

Which milestone checklist does Cocoon use?

The CDC's “Learn the Signs. Act Early.” checklist (2022, developed with the AAP): 50 milestones at 12 ages from 2 months to 5 years.

Does Cocoon adjust milestones for premature babies?

Yes. With a due date entered, the This week card and milestone ages use corrected age.

What if my baby hasn't reached a milestone yet?

Milestones are ranges. Cocoon never marks a baby as behind; if something worries you, it points you to your GP or child-health nurse.

Read more in the guides

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.

Milestones: 4–6 months

Between 4 and 6 months your baby starts rolling, reaching, babbling and sitting with a little help — and every baby gets there on their own timeline.

Milestones: 6–12 months

From sitting to first words, your baby's second half-year is full of big leaps — here's what to expect, and the wide range that's perfectly normal.

Milestones: 12–24 months

This is the busy, beautiful year your baby finds their feet, their first words, and a fierce little will of their own.

Tummy time

A few gentle minutes on the tummy each day builds the strong neck, shoulders and head shape your baby needs to grow.

Free tools

Baby Milestone Timeline
Try it in Cocoon

Milestones & development

Every feature is free right now — no ads, no subscription. Log feeds, sleep and nappies in seconds — and keep the memories too.

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Goes well with

Growth charts & 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.

How it works

Photo & video journal

The tracker that also remembers. Photos, videos, voice notes and words, kept right beside the feeds and naps — and yours to take with you.

How it works

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 works

See every feature