Safe sleep for babies: the rules that lower the risk of SIDS
A handful of habits, repeated at every nap and every night, make the biggest difference. They cost almost nothing.
Updated October 13, 2026 · sources checked October 13, 2026
In short
Place your baby on their back for every sleep, on a firm, flat surface with only a fitted sheet, in a crib or bassinet in your room for at least the first 6 months. Keep pillows, blankets, bumpers and toys out, avoid overheating, and never sleep with your baby on a sofa or armchair. These are the AAP's 2022 recommendations, echoed by the NHS.
Why safe sleep matters
The AAP estimates that around 3,500 babies in the United States die suddenly and unexpectedly during sleep each year, from sudden infant death syndrome (SIDS) or accidental suffocation and strangulation. The NHS defines SIDS as the sudden, unexplained death of an apparently healthy baby up to 12 months old; it is rare, and most likely in the first 6 months. No method removes the risk entirely, but a safe sleep environment lowers it, and it also prevents accidental suffocation.
The safe sleep checklist
Follow this for every sleep, day and night, until your baby's first birthday.
- On the back, every time. The side position is as dangerous as the tummy position (AAP). The NHS adds the "feet to foot" position: feet at the bottom of the cot or Moses basket. Babies do not choke on their backs, and the AAP says even babies with reflux should sleep flat on their backs.
- Firm and flat. The surface should not indent under your baby, and anything inclined more than 10 degrees is not safe for sleep (AAP, CPSC). The Lullaby Trust test: your baby's head should not sink in by more than a few millimetres.
- Keep it bare. A fitted sheet only (the CPSC's "bare" rule). No pillows, quilts, blankets, bumpers, toys, pods, nests or positioners. Crib bumpers are now subject to a federal ban in the United States (CPSC).
- In your room, not your bed. Both the AAP and the NHS recommend a separate crib, bassinet or Moses basket in your room for at least the first 6 months. The AAP says room sharing can lower the risk of SIDS by as much as 50%.
- Not too hot. The NHS and Lullaby Trust recommend a room at 16 to 20°C (about 61 to 68°F). The AAP rule of thumb: one layer more than you would wear. No hat indoors.
- Smoke-free and substance-free. No smoking or vaping during pregnancy or around your baby, even outside (AAP).
- Breast milk if you can, a pacifier at sleep time if you like. Both lower SIDS risk according to the AAP. If you breastfeed, wait until feeding is well established before offering a pacifier, and never tie it to clothing.
- Keep up with well-child visits and vaccinations. The AAP says evidence suggests infant vaccinations may help protect against SIDS.
The places that look cosy but are not safe
| Where | What the guidance says |
|---|---|
| Sofa, armchair, soft cushion | The AAP says the risk of sleep-related death is up to 67 times higher when a baby sleeps there with someone. Never fall asleep with your baby on one. |
| Adult bed | The AAP advises no bed sharing in any circumstance. The NHS gives safer co-sleeping steps but says never if you smoke, have had 2 or more units of alcohol, took drugs or drowsy medicine, or your baby was born before 37 weeks or under 2.5 kg (5.5 lb). |
| Car seat, swing, bouncer, sling | If your baby falls asleep there, move them flat on their back onto a firm surface as soon as you can (AAP). Take them out of the car seat when you arrive (NHS). |
| Inclined sleepers, nests, pods, hammocks, baby tents | Only safe if they meet federal safety standards for cribs, bassinets or play yards (AAP); the Lullaby Trust advises against pods, nests, hammocks and positioners. |
| Under weighted blankets or sleep sacks | Not recommended for babies under one (AAP, Lullaby Trust). |
What the AAP says about bed-sharing risk
| Situation | Risk of sleep-related death when bed sharing (AAP) |
|---|---|
| Adult is very tired, or has used alcohol, drugs or sedating medicine | More than 10 times higher |
| Baby younger than 4 months | 5 to 10 times higher |
| Baby born preterm or with low birth weight | 2 to 5 times higher |
US and UK advice: the one real difference
The AAP recommends never bed sharing. The NHS and the Lullaby Trust agree that a separate cot is the safest place, but because many parents do end up sleeping with their baby, they explain how to make it safer: firm, flat mattress, baby on their back, adult pillows and covers away, no swaddling, no other children or pets in the bed, and never leaving the baby alone in an adult bed. Both sets of advice agree on the dangerous situations above.
Products: what to buy and what to skip
The Lullaby Trust says you need very little: a cot or Moses basket, a firm flat mattress with a waterproof cover, a sleeping bag or sheets and a light blanket, and a room thermometer. In the UK, look for the relevant standards, such as BS EN 716-1 for cots and BS EN 16781 for baby sleep bags; in the US, the AAP and CPSC point to cribs, bassinets and play yards that meet federal requirements, and the CPSC recall list for second-hand items.
The Lullaby Trust also notes that a safety standard does not mean a product reduces SIDS risk, and that a product claiming "no baby has ever died using it" proves nothing. Our sleep sack and TOG guide explains how to choose a wearable blanket, and the newborn checklist keeps the shopping list short.
Swaddling and safe sleep
Swaddling does not reduce the risk of SIDS (AAP). If you swaddle, your baby must always be on their back, with room for the hips, and you stop as soon as they show signs of trying to roll. Full details on our swaddling page.
Emergencies
Call 911 (US) or 999 (UK) immediately if your baby stops breathing, will not wake, is struggling for breath, is stiff, shaking or jerking, turns pale, blue or grey, or is limp and floppy (NHS). In the UK, contact NHS 111 or your GP urgently if you think your baby might be ill. Knowing infant CPR is a real comfort: ask your pediatrician, hospital or the Red Cross (US) or St John Ambulance (UK) about a baby first aid course.
Questions parents ask
Until what age do safe sleep rules apply?
The AAP recommendations apply up to 1 year of age. The NHS says SIDS is most likely in the first 6 months but can affect babies up to 12 months; for premature babies, follow the advice for a year from the due date.
My baby rolls onto their tummy at night. Do I have to turn them back?
Always put your baby down on their back. The AAP says that once your baby rolls both ways comfortably, you do not need to keep turning them back, as long as the sleep space is bare.
Is co-sleeping ever safe?
The AAP advises against bed sharing in all circumstances. The NHS and Lullaby Trust explain how to make a bed safer if you do co-sleep, and list situations where it is very dangerous, such as after alcohol, smoking, drowsy medicines, or with a premature or low birth weight baby.
Do baby monitors or special mattresses prevent SIDS?
No product has been shown to. The AAP says not to rely on home cardiorespiratory monitors or wearable wellness devices to reduce SIDS risk, and to be wary of any product claiming it does.
Sources
- Moon R.Y. et al. — Sleep-Related Infant Deaths, Updated 2022 Recommendations (AAP policy statement, Pediatrics, 2022) checked October 13, 2026
- HealthyChildren.org (AAP) — How to keep your sleeping baby safe, AAP policy explained checked October 13, 2026
- NHS — Sudden infant death syndrome (SIDS) checked October 13, 2026
- The Lullaby Trust — How to choose baby sleeping products checked October 13, 2026
- U.S. Consumer Product Safety Commission — Safe Sleep checked October 13, 2026
Mamavela explains; it does not replace your midwife, doctor or pediatrician, who know your situation. If something worries you, call them. In an emergency, call 911 (US), 999 (UK) or 112.