Here's the checklist, and here's the most important thing about it: these are typical age windows, not deadlines. In the first year, most babies work through head control and social smiles (0–3 months), rolling and sitting with support (4–6 months), crawling, pulling to stand, and possibly first words (6–12 months) — but "most" is doing a lot of work in that sentence. Every baby develops at their own pace, and a baby who crawls late and talks early is just as on-track as the reverse.
Use this as a guide for what to watch for and celebrate, not a test to pass. And if anything genuinely worries you, skip the internet entirely and talk to your pediatrician — that's what they're for, and no question is too small.
What milestones happen from 0 to 3 months?
The newborn months look quiet from the outside and are anything but. Typical milestones in this window:
- Head control — first wobbly, then steadier during tummy time
- Eye tracking — following a face or a toy as it moves
- Social smiles — the first smile that's at you, not gas (you'll know)
- Cooing — those first soft vowel sounds, usually aimed at whoever's talking to them
The social smile is the one parents remember. It tends to arrive right around the point of maximum exhaustion, which feels like excellent timing on the baby's part. There's a fuller breakdown on our 0–3 month milestones page.
What milestones happen from 4 to 6 months?
This is when the baby stops being furniture and starts being a project. Typical milestones:
- Rolling over — often back-to-front first, often mid-diaper-change
- Sitting with support — propped in a corner of the couch like a tiny dinner guest
- Reaching and grasping — everything within arm's length is now theirs
- Laughing — real, out-loud laughter, frequently triggered by something inexplicable like a sneeze
- Consonant babbling — "ba," "da," "ma," deployed at random and melting grandparents anyway
That first laugh is worth recording as audio, not just as a note. It's one of the sounds parents most wish they'd saved. More detail on the 4–6 month milestones page.
What milestones happen from 6 to 12 months?
The second half of the first year is where the range between babies gets really wide, and that's completely normal. Typical milestones somewhere in this stretch:
- Sitting independently — hands free for grabbing things they shouldn't
- Crawling — in some style; the army crawl, the crab scuttle, and the bottom-shuffle all count, and some babies skip crawling altogether
- Pulling to stand — using the coffee table, the dog, your leg
- Cruising — sideways walking while holding furniture
- Pincer grasp — thumb and forefinger, mostly used on very small things headed for the mouth
- Peek-a-boo — full participation, endless demand for encores
- Possible first words — "mama," "dada," or something nobody predicted
Note the word "possible." Plenty of perfectly healthy babies reach their first birthday without a clear first word, and plenty are cruising at nine months while a friend's baby is happily stationary. Both babies are fine. The 6–12 month milestones page covers this window in more depth.
What comes after the first birthday?
A quick look ahead, because the first birthday isn't a finish line — it's an intermission.
From 12 to 14 months, many toddlers work on independent walking, pointing at things they want you to look at, a few simple words, and following simple instructions ("bring me the ball," followed occasionally by a ball). From 15 to 18 months, expect steadier walking, the beginnings of running, a vocabulary somewhere between 5 and 20 words, stacking blocks, and scribbling on whatever's available, including things that aren't paper.
When you get there: 12–14 months and 15–18 months.
What if my baby hasn't hit a milestone yet?
First: breathe. Milestone lists describe when things typically happen across a huge range of babies. Yours is one specific baby with one specific timeline, influenced by temperament, prematurity, birth order, and factors nobody can measure, like a personal policy against rolling over in front of witnesses. (Many babies debut new skills only after weeks of secret practice.)
These windows are guides, not deadlines. A milestone arriving late is very often just a milestone arriving late.
That said, you don't have to carry worry around by yourself. If your gut says something's off, or a milestone feels significantly delayed, bring it to your pediatrician. Not because something is wrong — usually it isn't — but because that's exactly the conversation checkups are built for, and a five-minute answer from a professional beats five hours of anxious searching every single time.
How do you actually keep track of all this?
Loosely, is the honest answer. Nobody needs a spreadsheet. But milestones have a sneaky way of blurring — was the first laugh in March or April? — and future-you will want to know.
The low-effort version: when something new happens, capture it in the moment with a photo, a quick note, or a voice memo. Keepsies has built-in age-based milestone tracking (plus custom ones, because "first time booing the opposing team" deserves recording too), and you can attach photos and audio to each one. That first laugh, saved as actual sound, is the kind of thing you'll replay for years.
However you track it — app, notebook, notes-to-self — the point is the same: this year only happens once, it happens fast, and every baby moves through it in their own order, at their own pace, and right on time for them.
Start capturing moments that matter
Keepsies is a free memory journal for parents. Milestones, quotes, artwork, and everyday moments — saved in seconds, kept forever.
From The Keepsies Team
