Your 4-Month-Old Baby: Grabbing, Rolling Over and Changing Nights

You hold out a rattle. Baby's hand sets off, misses, bangs the toy, tries again, then closes around it, and the rattle heads straight for the mouth. This little feat sums up the 4-month-old baby: they are starting to act on the world. One morning they may roll from tummy to back, to everyone's surprise.

Two new things need your attention this month: rolling, which changes the safety rules, and nights that, for some babies, get complicated. At 3 months, baby discovered their hands; at 4 months, they use them.

Grabbing: from the swatting hand to the gripping hand

According to CDC milestones, a 4-month-old generally holds the toy you slip into their hand, swings an arm towards what attracts them, brings their hands to the mouth and keeps the head steady when carried. UNICEF adds that many reach a hand towards a toy, shake the one they hold and coordinate hands and eyes better. The movement is still imprecise: often baby swats the object before managing to grasp it.

To train, the CDC advises placing baby on the floor, on a blanket, with a few safe toys around them, so they reach, kick and explore. Let them chew too: the mouth is part of learning, as long as the object is not sharp, hot or small enough to choke on. During a nappy change or bath, tell baby what you are doing, and look together at what interests them, advises UNICEF.

Rolling over: everyone has their own timetable

Rolling often comes around 3 or 4 months, sometimes earlier, notes the American Academy of Pediatrics (AAP). Yet the CDC lists rolling from tummy to back among the 6-month milestones, the age at which at least 75% of babies manage it. Both are true: some roll early, others take their time, and a 4-month-old who is not rolling yet is still within the norm.

UNICEF advises encouraging it on a firm surface, because rolling is harder on a soft one. A play mat big enough to roll on, laid on the floor, does the job nicely.

From the shop

Things to grab, shake and roll towards

A large mat for rolling on the floor, a soft ball that is easy to grasp, light rattles and an activity spiral for the pushchair: simple toys to exercise baby's hands and first rolls.

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Products sold by La Maison du Bébé, publisher of this magazine. Prices as of 12 October 2026; please check the product page.

Once baby rolls, never alone on a raised surface

A baby who rolls can fall from anything raised, and nobody knows in advance which day they will do their first roll. The CISSS de l'Outaouais, a Quebec health body, says it plainly in its fall-prevention guidelines: on the changing table, baby stays under constant supervision. Prepare nappy, wipes and clothes before putting baby down, and always keep a hand close.

In a Moroccan salon, think of the banquettes: baby is often set down between two cushions while the tea is served, and can end up on the floor. When in doubt, put baby straight on the floor, on a mat: they cannot fall any lower. Same logic for the parents' bed or the sofa. Burns, poisoning, small objects: the other hazards in the home are covered in our article on accidents at home.

Nights get complicated: what happens around 4 months?

Naître et grandir points out that there is no scientific consensus on what “sleeping through the night” means, and that a baby's sleep can regress and change from one night to the next. Between 3 and 6 months, waking 3 or 4 times a night is still normal. The expression “4-month regression” describes these periods when wakings return: what research says about it, and how to get through these phases, is explained in our article on sleep regression.

As for needs, the World Health Organization (WHO) counts 12 to 16 hours of sleep per 24 hours between 4 and 11 months, naps included. The things that help do not change: daylight walks, dark and calm nights, and a bedtime ritual repeated every evening (Naître et grandir).

Some good news along the way: according to Naître et grandir, the risk of sudden infant death falls from about 4 months, partly because baby is better at waking and crying when breathing is difficult. Sleeping on the back is still the rule until 1 year.

Baby watches your plate: time to start solids already?

On this point, recommendations differ. The WHO recommends exclusive breastfeeding until 6 months, then introducing foods from that age while continuing to breastfeed. In France, the 2021 recommendations, taken up by the Nutrition Committee of the French Society of Paediatrics, place the start of complementary feeding between 4 and 6 months, for a healthy full-term baby, breastfed or not. Neither advises starting before 4 months.

Why the gap? The French text relies notably on the risk of insufficient iron intake when exclusive breastfeeding goes on beyond 6 months. In practice, the right time is decided with your paediatrician, by looking at your baby rather than the calendar. Our guide to starting solid foods covers what follows.

The 4-month appointment

This is the time to raise the question of starting solids, have the growth curve checked and review the vaccines planned in Morocco's vaccination schedule. Tell the doctor about any milestone that seems to be missing: the CDC advises not waiting and, if doubt remains, asking for a developmental assessment. Next month, everything will end up in baby's mouth: we talk about it in the article on 5 months.