Tummy Time: Why It Matters and How to Make It Actually Work

Since the Back to Sleep campaign in the 1990s dramatically reduced SIDS rates by putting babies on their backs to sleep, tummy time has become the deliberate counterbalance — supervised, awake time on the stomach that gives babies the muscle-building practice they used to get more incidentally. It's not optional extra credit; it's how a baby builds the neck, shoulder, and core strength needed for rolling, sitting, and eventually crawling.

When to start

The American Academy of Pediatrics recommends starting tummy time from the first days home from the hospital — not waiting until a baby has some head control first ¹. That's a common misunderstanding worth correcting directly: head control is the outcome of tummy time, not a prerequisite for beginning it.

How much, realistically

Time it right after a diaper change or a nap, while your baby is calm and alert, and never straight after a feed ⁴.

What tummy time is actually building

It helps to know what you're working toward, because the payoff is invisible for the first several weeks and that's exactly when most people quietly give up.

• Neck and upper back strength — lifting the head, then holding it at 45°, then 90°

• Shoulder girdle and arm strength — pushing up on forearms, then on hands

• Core and trunk control — the foundation for rolling, then sitting unsupported

• Hand and visual development — bearing weight through the hands and tracking objects from a new angle

Rolling, sitting, and crawling all draw on strength built face-down. A baby who has had very little tummy time often reaches those milestones later, not because anything is wrong, but because the practice simply hasn't happened yet.

If your baby hates it — and many do

A baby who screams the moment they're placed on their stomach isn't unusual, and it doesn't mean tummy time should stop — it means the approach needs adjusting. A few things that genuinely help: doing it on your chest instead of the floor at first (your heartbeat and voice are calming, and it's still tummy-down work), keeping sessions very short and frequent rather than one long stretch, getting down on the floor at eye level to interact rather than leaving baby alone, and using a rolled towel under the chest for extra support in the earliest weeks.

A progression that works for most reluctant babies, moving on only when the current step is tolerated:

1. Chest-to-chest, you reclined, baby on you. Counts fully, and almost no baby objects.

2. Across your lap, tummy down, one hand on their back — easy to do during any spare minute.

3. Floor with a rolled towel under the chest and armpits, which takes some of the work out of lifting.

4. Flat on the floor, on a firm surface, with you at eye level.

Two minutes done well beats fifteen minutes of screaming. Frequency matters far more than session length at this stage, and five two-minute sessions is a perfectly good day.

Flat spots: what tummy time is preventing

This is the part usually left out, and it's the most concrete reason the minutes matter.

Because babies sleep on their backs — correctly, and this should not change — some develop a flattened area on the skull, called positional plagiocephaly. Its frequency rises from about six weeks, peaks around 4 to 6 months, and then declines as babies start turning, sitting and gaining trunk control ².

The timing cuts both ways. If pressure keeps landing on the same spot, the deformation is likely to become permanent by around 6 to 8 months ² — so the window for easy, cost-free correction is exactly the window when most parents haven't thought about it yet. Prevention is repositioning and tummy time, both started early ²³.

What that looks like day to day:

• Alternate head position during sleep — same back-sleeping position, head turned a different way.

• Alternate which end of the crib you lay your baby down at, so turning toward the room's light or door isn't always the same direction.

• Switch arms when bottle feeding, which changes which side of the head rests against you.

• More tummy time, which is the only position that takes pressure off the skull entirely. Fewer than three sessions a day is a documented risk factor ².

Torticollis: the thing behind most flat spots

If your baby strongly prefers turning their head one way, that preference deserves attention rather than accommodation. Torticollis — tightness in the neck muscles on one side — is present in 93% of children with plagiocephaly ². The flat spot is usually the visible symptom; the neck is usually the cause.

Signs worth raising with your pediatrician: your baby almost always turns their head to the same side, resists being turned the other way, tilts their head consistently toward one shoulder, or strongly prefers feeding on one side. It's very treatable — typically stretching exercises done at each diaper change, plus physiotherapy where needed ² — and it responds much better early than late.

The container problem

Car seats, swings, bouncers, loungers and carriers all hold a baby in the same semi-reclined position with the back of the head supported. Each is genuinely useful; the issue is cumulative time.

A baby who goes from crib to car seat to bouncer to swing can spend most of their waking hours with pressure on the same part of the skull and no opportunity to push against anything. The practical rule is simply that the car seat is for the car — once you're home, the baby comes out of it. Floor time on a firm, flat surface, on their back or their tummy, is where the strength gets built.

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