Baby Milestones Month by Month UK (0–24 Months)

"Is my baby on track?" is the question that loops in every parent's head, usually at 2am with a phone in hand. This is a calm, UK-aligned month-by-month milestone guide for the first two years: when babies typically smile, roll, sit, crawl, walk and talk, what the health-visitor reviews actually look for, and the handful of red flags worth raising with your GP. The golden rule first: milestones are ranges, not deadlines. Healthy babies hit them across wide windows, and "average" is not the same as "on time".

How milestones really work (read this first)

Development isn't a checklist with a pass mark. Babies work on different skills at different speeds — a baby pouring energy into rolling and crawling may say their first word later, and catch up in a fortnight. Four things worth holding in mind:

Ranges, not dates. "Walks by 18 months" is the outer edge of normal, not a target for 12 months.
Direction over speed. Health visitors care that skills keep appearing, not that they appear early.
Corrected age for prematurity. If your baby was born early, judge milestones from their due date, not their birth date, until about age 2.
Losing a skill matters. Going backwards — losing words or babble, stopping eye contact — is always worth a same-week GP call.

Baby milestones by age: a UK chart (0–24 months)

This is the typical shape of development. Your baby is the only baby who matters; use this to spot patterns, not to award marks.

Age	Movement	Communication & social
0–6 weeks	Lifts head briefly during tummy time; jerky movements settle.	First social smile (around 6 weeks); calms to a familiar voice.
3–4 months	Good head control; pushes up on forearms; may roll front-to-back.	Coos and gurgles; laughs; follows faces across the room.
6 months	Rolls both ways; sits with support; reaches and grabs.	Babbles ("ba", "da"); turns to your voice; mouths everything.
9 months	Sits unsupported; may crawl, shuffle or commando-crawl; pulls to stand.	Babble strings ("babababa"); responds to their name; peekaboo.
12 months	Cruises along furniture; may stand alone or take first steps.	First word or two; waves bye-bye; points at things they want.
15–18 months	Walks confidently; stoops and climbs; starts to run.	Several words; follows a simple instruction; copies you.
2 years (24 months)	Runs, kicks a ball, walks up stairs holding on; scribbles.	Two-word phrases ("more milk"); ~50+ words; pretend play.

"When do babies…?" — the questions parents actually search

The honest answers, with the normal range rather than a single magic number.

Smile: a real social smile usually arrives at 6–8 weeks. (Windy "smiles" before that are practice.)
Roll over: front-to-back from around 4 months, back-to-front a little later. Anywhere up to 6–7 months is normal.
Sit up unsupported: typically 6–9 months.
Crawl: 7–10 months — and some babies skip crawling entirely and go straight to cruising. That's fine.
Pull to stand & cruise: 9–12 months.
First word: around 12 months, but 9–14 months is all normal.
Walk independently: most between 12 and 18 months. Not walking by 18 months is the point to mention it to your health visitor.
Two-word phrases: around 2 years.

The UK health-visitor reviews (and what they check)

In England, the Healthy Child Programme offers a set of universal reviews. Scotland, Wales and Northern Ireland run very similar schedules. These aren't exams — they're a chance to flag anything early.

6–8 week review: feeding, weight, head control, social smile, and a physical check (often alongside the GP baby check).
9–12 month review: sitting, mobility, babbling, understanding, and how they respond to you.
2–2½ year review: often uses the Ages & Stages Questionnaire (ASQ-3) covering communication, movement, problem-solving and social skills.

Tip: turning up to these with a quick note of what your baby is doing — and when each "first" happened — makes the conversation far more useful than trying to remember on the spot.

Milestones for premature babies (corrected age)

If your baby arrived early, use their corrected age — their age from the original due date — to judge milestones. A baby born 8 weeks early at 6 months actual age is developmentally around 4 months, and that's exactly where you'd expect them to be. Most catch up to actual age by about 2 years. Your neonatal or community team will guide you.

Developmental red flags worth a GP chat

The vast majority of "late" milestones are simply normal variation. But raise these with your GP or health visitor — sooner rather than later, because early support helps:

Not smiling socially by 3 months.
Not holding their head steady by 4 months.
Not sitting with support by 9 months, or not babbling by 9 months.
No words, pointing or gestures (like waving) by 12–15 months.
Not walking by 18 months.
No two-word phrases by 2 years.
Losing skills they previously had at any age, or persistent lack of eye contact.
Strong, consistent preference for one hand before 12 months (can suggest a movement issue on the other side).

None of these mean something is wrong — they mean it's worth a professional look. Trust your gut; you know your baby better than any chart.

Simple ways to help development (no flashcards required)

Tummy time from day one, a few minutes often — it builds the neck and core strength behind rolling, sitting and crawling.
Talk and narrate constantly. Your running commentary ("we're putting your socks on") builds language long before first words.
Read together daily, even at a few weeks old. Pointing at pictures teaches the point-and-name link.
Floor time over containers. Time out of bouncers and walkers, on a safe floor, is where the milestones get practised.
Follow their lead. Copy their sounds and gestures — that back-and-forth is the engine of social development.

How CubTrack helps you track milestones (without the baby-book guilt)

Milestones are easy to miss in the blur of the first two years — and impossible to remember exactly when the health visitor asks. CubTrack's milestone tracker lets you tap to log each first — smile, roll, sit, crawl, first word, first steps — with the date attached, add a photo, and see them laid out on one calm timeline. Both parents (and grandparents, if you share) see the same record, so nobody misses the big moments or argues about whether it was Tuesday or Wednesday. When the 2-year review rolls around, it's all there.

Download CubTrack free on Android — iOS is coming soon.

Milestone FAQs

My baby isn't crawling — should I worry?

Not necessarily. Some babies bottom-shuffle, commando-crawl, or skip crawling and go straight to cruising and walking. What matters is that they're finding some way to get moving and exploring. If there's no attempt at mobility by around 12 months, mention it at your review.

Is my baby behind if they're at the late end of every range?

Being consistently at the later (but still normal) end is usually just your baby's pace, especially if they're progressing steadily. It's a plateau or regression — not slow-but-steady progress — that warrants a closer look.

Do milestone charts apply to twins?

Yes, but twins are often born earlier, so use corrected age. They may also reach social milestones at slightly different times to each other — that's normal.

Should I use corrected age, and for how long?

Use corrected age (age from the due date) for premature babies until around 2 years, by which point most have caught up.

How accurate are baby milestone apps?

An app is a record-keeper, not a diagnosis. Use one to log when things happened and spot patterns — then take that record to your health visitor or GP, who can assess properly.

Want every "first" in one calm place? Get CubTrack free on Android and log smiles, rolls, crawls, words and first steps with a tap — ready for every health-visitor review.

Baby Milestones Month by Month: A UK Development Guide (0–24 Months)