What tummy time is for

Tummy time is time spent awake, supervised and on the front. It exists because the safest sleeping position — on the back, every sleep — is not a position that builds neck, shoulder and trunk strength. Awake time on the front does that instead. The American Academy of Pediatrics frames it as a pair: back to sleep, tummy to play.

The AAP says tummy time helps babies "develop strong muscles" and "prepares babies for being able to slide on their bellies and crawl". You can see the progression in the CDC's milestone checklists: at two months most babies hold their head up when on their tummy; by four months they push up onto elbows or forearms; by six months they push up with straight arms and roll from tummy to back. Each of those is built from the one before.

How much, and from when

The AAP gives an unusually concrete starting protocol: "You can start the day your baby gets home from the hospital." Then, "play and interact with your baby while they are awake and on their tummy 2 to 3 times each day for a short time (3 to 5 minutes)", and "work up to 15 to 30 minutes each day by 7 weeks".

The World Health Organization sets a slightly different marker for the whole first year. In its guidelines on physical activity, sedentary behaviour and sleep for under-5s, infants who are not yet mobile should have "at least 30 minutes in prone position (tummy time) spread throughout the day while awake".

Note "spread throughout the day". Nobody is asking for a thirty-minute block. Six five-minute stretches count, and for most newborns that is the only version that works.

Time out of seats counts too

The same WHO guidance says infants should "not be restrained for more than 1 hour at a time" — prams, high chairs, bouncers and car seats all count. The CDC makes the same point in its four-month tips: "Let your baby have time to move and interact with people and objects throughout the day. Try not to keep your baby in swings, strollers, or bouncy seats for too long." Floor time is tummy time's easier cousin, and it does much of the same work.

What is normal, as a range

Plenty of babies dislike tummy time at first, and disliking it is not a problem to be solved in one session. A newborn who manages ninety seconds and complains is doing tummy time. Tolerance usually grows over weeks rather than days, and it grows faster with short, frequent, cheerful attempts than with long endured ones.

Positions that count: on a firm surface with toys at eye level, across your lap, or chest-to-chest with you reclined. The CDC's two-month tip is exactly this: "Lay your baby on his tummy when he is awake and put toys at eye level in front of him. This will help him practice lifting his head up."

Flat spots

The AAP acknowledges the worry directly: it is possible for a baby to develop a flat spot on the head, but "it usually rounds out as they grow older and sit up". Its suggestions are to alternate which end of the cot your baby's head lies at, vary awake positions, limit time in swings, bouncy chairs and car seats, and switch feeding sides.

What is not normal

Tummy time is also a window onto strength and symmetry, which is why what you notice during it is worth reporting. Raise it if your baby consistently turns their head only one way or seems unable to turn it the other; if a flat spot is getting more pronounced rather than less; if by around four months your baby cannot hold their head steady when held upright; if one side of the body works noticeably harder than the other; or if your baby has lost a skill they previously had.

The safety rules

Awake and watched, always. The AAP is explicit that tummy time is for babies "who are awake and being watched". The CDC adds: "Do not leave your baby alone."
If they get sleepy, the session is over. The CDC's instruction is unambiguous: "If he seems sleepy, place him on his back in a safe sleep area (firm mattress with no blankets, pillows, bumper pads, or toys)."
Never a sleeping position. The NHS advice on reducing the risk of sudden infant death syndrome is to "always place your baby on their back to sleep", and to move them back if they roll, until they can roll both ways by themselves.
Not straight after a feed if it makes your baby uncomfortable — a short gap usually helps.

When to speak to a health visitor or doctor

Bring it up at your baby's routine reviews, or sooner if any of the concerns above apply. Head shape, head control and side-to-side symmetry are all things a health visitor or GP can assess, and where treatment helps it tends to help more when started early. If your baby was born prematurely, compare them against their corrected age, not their birthday, before deciding anything is behind.

What actually helps

Get down on the floor at eye level rather than watching from above — your face is more motivating than any toy. Use a mirror; the CDC suggests placing a baby-safe one nearby. Go often and briefly. Fold it into things you already do, like the minutes after a nappy change. And stop while it is still going well, so the next attempt starts from a good memory rather than a bad one.

Tummy Time