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.
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.
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 links to CDC milestone information. Unticked items are not evidence of a developmental delay.
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
- Open Care → Milestones & development for the checklist at your baby's age.
- Tick milestones as they happen; add a photo or note.
- Glance at the This week card on Home.
- 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
Baby milestones 0–3 months: what to expect and when to check
What most babies do by 2 months, how skills grow towards 3–4 months, simple ways to play, corrected age for premature babies and when to get advice.
Baby milestones 4–6 months: rolling, reaching, laughing and babbling
What most babies do by 4 and 6 months on the CDC checklists, how skills change in between, how to help through play and when to talk to a professional.
Baby milestones 6–12 months: sitting, crawling, waving and first words
The CDC's 6-, 9- and 12-month checklists explained, when babies sit, crawl and stand, play ideas, home safety and the signs worth raising early.
Toddler milestones 12–24 months: walking, words and play
The CDC's 15-month, 18-month and 2-year checklists, the toddler word spurt, play ideas, safety for new walkers and the signs worth checking early.
Tummy time: when to start, how long by age and what if baby hates it
How to start supervised tummy time from birth, how much to aim for as your baby grows, positions that help, and how it relates to flat spots and safe sleep.
Free tools
Milestones & development
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
Weight, height & growth tracking
Add a measurement when you have one. Find earlier weights, lengths, clothing and nappy sizes, and first milestones together in Growth. Tracking is optional.
How it worksPhoto & 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 worksCheckup report & PDF summaries
Bring selected records and the questions you want to discuss. Check the dates, note what is missing and let your care team interpret the information.
How it works