Somewhere between 4 and 6 months, your baby shifts from watching the world to grabbing at it. Movements get smoother, hands get busy, and the sounds get a lot more fun. If the baby at playgroup rolled weeks ago and yours hasn't, don't worry — this stage has a wide normal range, and most of what you'll see is your baby practising in their own order, at their own pace.
What you might see this stage
These are the headline skills for 4–6 months. They tend to overlap and arrive in any order.
Around 4–6 months
- RollingOften tummy-to-back first, then back-to-tummy. Many babies roll around 4–6 months, some later.
- Reaching & graspingSwipes at toys, grabs with the whole hand, brings things (and feet!) to the mouth.
- BabblingCooing turns into consonants — 'baba', 'gaga', squeals and raspberries.
- Sitting with supportHolds the head steady and sits propped or in a high chair; tripod-sits briefly by around 6 months.
Rolling usually starts with a wobble from tummy to back. Plenty of tummy time on the floor is the best practice ground, and it strengthens the neck, shoulders and core your baby needs for sitting next.
Reaching and grasping is where curiosity meets coordination. Offer a few safe, mouthable toys within arm's reach — everything is going straight to the mouth, and that's normal exploring.
Babble is your baby experimenting with sound. Chat back, name things, pause for their "reply". This back-and-forth is the foundation of language.
Sitting comes gradually: head control first, then propped sitting, then a short tripod sit. Stay close — a new sitter topples easily.
Variation is normal
Milestones are signposts, not a timetable. The WHO's own milestone study found healthy babies reach skills like sitting without support across a window of several months. Babies born early should be tracked by their corrected age (age from the due date) until about two years.
It's the pattern over time that matters most — steady forward progress, and using both sides of the body fairly evenly.
Keeping this stage safe
A more mobile baby means a few things to watch.
- Never leave baby unattended on a change table, bed or couch — rolling can start without warning.
- If you're starting solids around now, sit baby upright and supervise every mouthful, and avoid whole nuts, hard chunks and other choking hazards.
- Mouthing everything? Keep small objects, button batteries and cords out of reach.
When to ask
Trust your instincts — you know your baby. It's worth a chat with your GP or child-health nurse if, by around 6 months, your baby:
| Area | Worth asking about if… |
|---|---|
| Movement | Not rolling at all, seems stiff or very floppy, or clearly favours one side |
| Head control | Head still flops back when pulled to sit |
| Hands | Not reaching for or holding objects |
| Sounds | Not babbling, cooing or making sounds |
| Social | No smiling, eye contact or response to your voice |
| Any age | Your baby has lost a skill they used to have |
Losing a skill, or a strong gut feeling that something's off, always deserves a prompt check — earlier support works best, and a quick visit can be wonderfully reassuring.
A quick reassurance: milestones are a range, not a race. Offer floor time, toys to grab and lots of chatter, keep sleep safe, and bring any worries to your child-health nurse. You're doing the work that helps your baby grow — one wobbly roll at a time.
Guidance here reflects Raising Children Network (AU), the AAP/HealthyChildren (US) and the WHO, with safe-sleep advice from Red Nose Australia. Regional advice can differ slightly on specifics like vitamin D — your local child-health service can tailor it to you.