Can babies sleep on their tummy?
Back for every sleep, a clear cot, the right tog and what changes once your baby learns to roll.
In short
No. Babies go down on their back for every sleep until at least 12 months, in a clear cot with a firm flat mattress, in your room for the first 6 months. Once they can roll both ways themselves, you still start them on their back but you do not need to keep flipping them over at night.
- Back for every sleep, day and night. Tummy time is for awake, supervised play.
- Side sleeping is not safe. It is one small roll from tummy sleeping.
- The cot holds a baby, a firm flat mattress and a fitted sheet. No pillows, duvets, bumpers, wedges or soft toys.
- Room at 16 to 20 degrees, sleeping bag tog matched to the room, no hats indoors.
- Never sleep with a baby on a sofa or armchair. It is the highest-risk sleep place there is.
No. Babies should be put down on their back for every sleep, day and night, naps included, until they are at least 12 months old. Back sleeping is the single best-evidenced protection against sudden infant death, and it has been since the advice changed worldwide in the 1990s.
That is the headline. The rest of this guide covers the questions that follow it: side sleeping, what happens when the baby starts rolling themselves, what belongs in the cot, togs and room temperature and the co-sleeping conversation nobody has out loud. It is consistent with HSE guidance, and the HSE's own safe sleep page is the official version.
Can newborns sleep on their side?
No. Side sleeping is not a safe halfway house. A baby settled on their side is one small wriggle from ending up face-down, and a young baby cannot reliably roll back or lift their head clear. The back is the position that keeps the airway open and the face clear.
If your baby seems to hate lying flat because of wind or reflux, feed a little earlier before sleep, keep them upright on your shoulder for a while after feeds and talk to the PHN. The answer is never a side position, a wedge or a propped mattress. Our colic, reflux and wind guide covers what genuinely helps.
What changes when my baby starts rolling over?
Somewhere around 4 to 6 months most babies learn to roll, and soon after that they roll both ways with confidence. Two things follow:
- Keep putting them down on their back for every sleep. That does not change.
- Once they can roll both ways easily, you do not need to spend the night turning them back over. A baby who can get themselves onto their tummy and off it again is allowed to choose their own position mid-sleep.
Stop swaddling at the first sign of rolling. A swaddled baby who reaches their tummy cannot push up or roll back, so the swaddle has to go as soon as rolling is even attempted, usually by 3 to 4 months. Swap to a sleeping bag, which keeps arms free. The rolling phase is also when a completely clear cot matters most, because a mobile baby will find anything left in there. Rolling practice at 2am is a known thief of sleep, and the 4-month regression guide explains that particular chaos.
What should be in the cot?
A baby, a firm flat mattress that fits without gaps and a fitted sheet. That is the whole list.
- No pillows or duvets before 12 months.
- No cot bumpers, wedges, positioners or sleep pods. Products that promise safer sleep by adding padding do the opposite.
- No soft toys in the cot for sleep in the first year.
- Blankets: if you use them instead of a sleeping bag, use thin cellular blankets, tucked in below shoulder height, with the baby's feet at the foot of the cot so they cannot wriggle down under the covers.
- Position: the cot or crib goes in your room for at least the first 6 months, away from radiators, direct sunlight and blind cords.
A clear cot looks bare in the photos. Bare is the point.
What tog sleeping bag does my baby need?
A baby sleeping bag solves two problems at once: nothing loose in the cot and no kicked-off blankets at 3am. The tog rating is the warmth, and you match it to the room, then adjust the clothes underneath.
| Room temperature | Sleeping bag | What to wear under it |
|---|---|---|
| 24 degrees or warmer | 0.5 tog | Vest only, or just a nappy in a heatwave |
| 21 to 23 degrees | 1.0 to 1.5 tog | Short-sleeved vest |
| 18 to 20 degrees | 2.5 tog | Long-sleeved vest or a light sleepsuit |
| 16 to 17 degrees | 2.5 tog | Vest plus sleepsuit |
| Below 16 degrees | 2.5 tog | Vest plus sleepsuit, and try to nudge the room warmer rather than adding loose bedding |
Brands differ, so follow the chart printed on your own bag, and make sure the bag is the right size at the neck so the baby cannot slip down inside it. Judge temperature by putting a hand on the chest or the back of the neck: warm is right, sweaty or clammy is too hot. Hands and feet always run cool and are not the gauge. In an Irish summer bedroom our hot weather guide has the workarounds.
What temperature should the baby's room be?
16 to 20 degrees Celsius is the HSE-recommended range, and in an Irish house that usually means the baby's room is cooler than you would choose for yourself. Overheating raises the risk of sudden infant death, so cooler wins whenever you are torn.
No hats indoors for sleep, ever. Babies dump heat through their heads, and a hat blocks the exit. A room thermometer takes the guesswork out, and the HSE's sleep temperature page covers the detail. A smoke-free home matters here too: smoking in pregnancy or around the baby is one of the biggest avoidable risk factors there is.
How do I get my baby to sleep in the cot?
The safest sleep place is also the one many babies protest hardest, and a baby who only sleeps on a chest is a very normal problem. What helps, gradually:
- Time the attempt. An overtired baby fights the cot hardest. Aim the put-down inside the right wake window for their age, and the wake windows chart gives you the target.
- Same wind-down every time. Feed, nappy, sleeping bag, same song, cot. Babies learn sequences long before words.
- Put them down drowsy but awake when you can. When it fails, and it often will for a while, pick up, calm, try again or park it for this nap. No single nap decides anything.
- Start with one cot nap a day, usually the first morning nap, when sleep pressure is easiest to work with. Contact naps for the rest are fine while you build.
- Warm hands, slow lowering, feet first, and keep a hand on their chest for a few breaths after landing.
None of this is instant, and a baby who still refuses the cot at some naps is not failing anything. Our guide to when babies sleep through the night has the wider picture on what is normal.
Is co-sleeping ever safe?
The safest place for a baby to sleep is their own cot or crib in your room for at least the first 6 months. That is the HSE position, and it is ours.
The honest bit: exhausted parents sometimes fall asleep with the baby whether they planned to or not, and an unplanned doze is where the risk concentrates. So:
- Never fall asleep with a baby on a sofa or armchair. It is the highest-risk sleep surface there is. If you are feeding at night and feel yourself going, feed sitting up in bed instead.
- Never bed-share after alcohol, cigarettes or any medication that makes you drowsy, and not with a premature or low birth weight baby.
- If there is any chance you will doze while feeding in bed, prepare the bed first: pillows and duvet well away from the baby, baby on their back on a firm mattress, never between a parent and a wall or a parent and a pillow.
Planning for the 3am reality protects the baby better than pretending it will not happen. The HSE's safe sleep guidance spells out the same rules.
How do I keep sleep safe when I am running on empty?
Most safe sleep slips happen at the exhausted end of the night: the sofa doze, the blanket added at 4am, the swaddle kept one week too long. The fix is rarely more willpower, it is knowing where the night actually stands. Lullagram logs every sleep and feed one-handed in the dark, shows both parents the same night in real time so handovers actually work, and its Sleep Window predicts when the next sleep is due, which makes the calm cot put-down possible instead of theoretical. It is free to try on Android, iPhone and web.
This is a guide, not medical advice. For anything about your own baby, talk to your PHN or GP, and in an emergency call 112 or 999.