Safe sleep for babies: the essentials, in one calm place

There’s a lot of noise around baby sleep: schedules, methods, gadgets, opinions. Safe sleep is the one part that isn’t up for debate, and it’s reassuringly simple. These are the essentials, drawn from the American Academy of Pediatrics (AAP), the HSE, the NHS and the Lullaby Trust. Where they differ, we say so.

Sudden infant death syndrome (SIDS, sometimes called cot death) is rare, and following these steps lowers the risk further. You don’t need to be perfect. You need a few habits you can stick to at 3am.

Back to sleep, every sleep

Lay your baby on their back for every sleep, naps included, day and night. Side sleeping isn’t a safe alternative, because babies can roll from their side onto their tummy (HSE). Back sleeping doesn’t increase the risk of choking if your baby is sick.

Use the feet-to-foot position: your baby’s feet at the bottom of the cot or Moses basket, so they can’t wriggle down under any covers.

Once your baby can roll both ways by themselves, you can let them find their own position. Still put them down on their back each time (Lullaby Trust).

A clear, firm, flat space

• A cot, crib or Moses basket with a firm, flat, well-fitting mattress and a fitted sheet.
• Nothing else in it: no pillows, duvets, quilts, bumpers, cot positioners, wedges, nests or soft toys.
• Avoid anything that tilts your baby. The AAP says any sleep surface inclined more than 10 degrees is unsafe.
• If you use a blanket, choose a cotton cellular one, tucked in firmly no higher than your baby’s shoulders. A well-fitting, low-tog baby sleeping bag without a hood is a good alternative (HSE).

Room-share for at least six months

The safest place for your baby to sleep is in their own cot in the same room as you, for every sleep, for at least the first 6 months (HSE, NHS, AAP).

Bed-sharing: where the advice differs

This is the area where you’ll hear different messages.

• The AAP advises against bed-sharing in all circumstances.
• The HSE says bed-sharing can be dangerous and that a separate cot in your room is safer.
• The NHS and Lullaby Trust take a harm-reduction approach. They recognise that many parents do end up sleeping with their baby, so they explain how to make it less risky.

All of them agree on when bed-sharing is especially dangerous: if you or your partner smoke, have drunk alcohol, have taken drugs or medicine that makes you drowsy, or are extremely tired; or if your baby was born prematurely or at a low birth weight. The HSE also says not to bed-share with a baby under 3 months.

If there’s any chance you’ll fall asleep with your baby in bed during a night feed, the Lullaby Trust suggests preparing the bed beforehand: keep pillows and adult bedding away from your baby, make sure they can’t get trapped between the mattress and a wall, and never leave them alone in an adult bed (Lullaby Trust).

Keep them cool, uncovered and smoke-free

• Room temperature: around 16–20°C. Feel your baby’s tummy or the back of their neck; it should be warm, not hot or sweaty (HSE).
• No hats indoors for sleep, and keep their head and face uncovered.
• A nappy, vest and babygro, plus a light blanket or sleeping bag, is usually plenty. Use less if your baby is unwell with a temperature.
• Don’t put the cot next to a radiator, heater or fire, or in direct sunlight.
• Keep your baby’s environment smoke-free, before and after birth.

Swaddling, weighted products and dummies

• Swaddling: if you swaddle, stop as soon as your baby shows any signs of trying to roll. The AAP notes some babies start working on this as early as 2 months (AAP).
• Never use weighted swaddles, sleeping bags or blankets.
• Dummies: the AAP notes that offering a dummy at sleep time is linked with a lower SIDS risk. If you’re breastfeeding, wait until feeding is well established. Never attach a dummy to a cord or clothing for sleep.
• Breastfeeding is associated with a lower risk of SIDS, but any amount you can manage counts, and formula-fed babies can sleep safely too.

Car seats, slings and naps on the go

Car seats, swings, bouncers and slings aren’t designed for unsupervised sleep. If your baby falls asleep in one, move them to a flat cot on their back as soon as practical (AAP).

If you use a sling or carrier, follow the T.I.C.K.S. checklist: tight; in view at all times; close enough to kiss; keep chin off the chest; supported back (Lullaby Trust). Our guide to contact naps covers holding a sleeping baby safely.

When everyone is exhausted

Unsafe sleep tends to happen when parents are running on empty: a sofa at 4am, an unplanned doze with the baby on your chest. If you’re struggling, that’s not a failing. It’s a signal to share nights, ask for help, and talk to your public health nurse or health visitor. Tough phases like the 4 month regression are often when this matters most.