Safe Sleep for Babies: The Rules That Actually Matter
Written by the Growbaby team
Written against AAP, CDC, NIH, NHS and CPSC guidance. How we write these guides
Published Aug 3, 2026 Updated Oct 23, 2026
At a glance
- Back to sleep, for every sleep, day and night, until your baby’s first birthday.
- A firm, flat, empty surface: crib, bassinet or play yard with a fitted sheet and nothing else.
- Share a room, not a bed, for at least the first 6 months.
- Stop swaddling as soon as your baby shows any sign of trying to roll.
- Sleep positioners, wedges, crib bumpers and inclined sleepers are not safe and are not recommended.
- The AAP says the risk of sleep-related infant death is up to 67 times higher when a baby sleeps with someone on a couch, soft armchair or cushion.
The rules with the strongest support are short: place your baby on their back for every sleep, on a firm, flat surface with nothing on it but a fitted sheet, in your room but not in your bed. The American Academy of Pediatrics (AAP) recommends all of this for babies up to 1 year of age, the CDC supports the AAP’s 2022 recommendations, and the NIH Safe to Sleep campaign bases its advice on them.
Two things are easy to miss: how large some of the differences in risk are, and that the official sources do not agree on everything. This page gives the figures the AAP and Safe to Sleep publish, and says where the UK’s NHS advises differently, without picking a side.
Back to sleep, every time
Place your baby on their back for every sleep, including naps, until their first birthday. The AAP says the side position is just as dangerous as the stomach position, partly because a baby placed on their side can roll more easily onto their stomach. Safe to Sleep says that putting a baby who usually sleeps on their back onto their stomach or side, like for a nap, increases the risk of SIDS by up to 45 times.
Back sleeping is not a choking risk. The AAP says babies will not choke on their backs because their airway anatomy and gag reflex keep that from happening, and that even babies with gastroesophageal reflux disease (GERD) should sleep flat on their backs.
The rule applies to everyone who ever puts your baby down. Safe to Sleep asks parents, grandparents, babysitters, child care providers and anyone else who might care for a baby to learn it.
Once your baby can roll from back to stomach and from stomach to back on their own, you can leave them in the position they choose. Keep starting every sleep on the back. Safe to Sleep adds that if your baby can only roll one way, you can turn them onto their back if they roll onto their stomach during sleep. Our guide to rolling over covers when that ability usually arrives.
The surface and what is on it
Use a crib, bassinet, portable crib or play yard that meets the safety standards of the US Consumer Product Safety Commission (CPSC), with a mattress designed for that crib that fits tightly, and a fitted sheet. The AAP defines firm as a surface that does not indent when your baby is lying on it, and says any surface that inclines more than 10 degrees is not safe for your baby to sleep on.
Other sleep products count only if they meet the same standards. The AAP says alternative sleep surfaces are a safe option only if they comply with a June 2021 CPSC rule that all infant sleep products meet the federal safety standards for cribs, bassinets, portable cribs or play yards. The products it names include inclined sleep products, hammocks, baby boxes, in-bed sleepers, baby nests and pods, and travel bassinets.
Nothing else belongs in the space: no blankets, pillows, crib bumpers, wedges, positioners or stuffed toys. The CPSC’s shorthand is “Bare is Best”. For warmth, the AAP suggests layers of clothing or a wearable blanket. The AAP, the CPSC and Safe to Sleep all say not to use weighted blankets or weighted swaddles.
Car seats, strollers, swings, infant carriers and slings are not sleep surfaces. If your baby falls asleep in one, the AAP says to move them to a firm sleep surface, on their back, as soon as possible.
Room-sharing, not bed-sharing
Keep your baby’s own sleep space in the room where you sleep for at least the first six months. The AAP says room sharing can decrease the risk of SIDS by as much as 50% and is much safer than bed sharing, and it recommends that parents avoid bed sharing under any circumstances, including with twins and other multiples.
If you bring your baby into your bed to feed or comfort them, the AAP says to put them back in their own sleep space before you go to sleep. If there is any chance you will fall asleep, remove pillows, blankets, sheets and anything else that could cover your baby’s face, head or neck, and if you do fall asleep, move your baby back as soon as you wake. Safe to Sleep adds that the longer an adult shares a bed with a baby, the higher the baby’s risk.
Babies exposed to nicotine during pregnancy or after birth are at higher risk of SIDS, and the AAP says the risk is especially high when they sleep with an adult who smokes or vapes. It also puts figures on the riskiest situations:
- Up to 67 times higher risk of sleep-related infant death when a baby sleeps with someone on a couch, soft armchair or cushion.
- More than 10 times higher when a baby bed shares with someone who is fatigued, has taken medication that makes it harder to wake, or has used alcohol or drugs.
- 5 to 10 times higher when bed sharing with a baby younger than 4 months.
Swaddling, pacifiers and the rest
Swaddling may help calm a newborn, but the AAP says it does not reduce the risk of SIDS. A swaddled baby should always be placed on their back. Stop swaddling as soon as your baby shows any sign of trying to roll: the AAP says some babies start working on rolling as early as 2 months, and that the risk of suffocation is higher if a swaddled baby rolls onto their stomach.
The same deadline applies to wearable blankets or sleep sacks that compress the arms, chest and body. Sleep sacks that do not swaddle and let your baby move freely can be used as long as you want. For the hips, the AAP’s swaddling page describes hip-healthy swaddling that lets the legs bend up and out, and says you should be able to get at least two or three fingers between your baby’s chest and the swaddle.
Offering a pacifier at nap time and bedtime helps reduce the risk of SIDS, the AAP says, even if it falls out after your baby is asleep, and you do not have to put it back in. If you are breastfeeding, wait until breastfeeding is established. Safe to Sleep adds that the pacifier should not be attached to clothing, stuffed toys or blankets, or coated with anything such as honey, and that finger or thumb sucking does not reduce SIDS risk.
The AAP says not to use home cardiorespiratory monitors as a way to reduce the risk of SIDS. Consumer wellness devices, including wearable heart rate and pulse oximetry monitors, do not have to meet the same requirements as medical devices, and the AAP says there is no evidence they decrease SIDS risk. It is fine to use one if you want to, it says, as long as it is not a substitute for the safe sleep guidelines.
Be wary of any product sold as reducing the risk of SIDS. The AAP says there is no evidence for such claims, and its swaddling page says wedges, positioners, special mattresses and specialized sleep surfaces have not been shown to reduce the risk.
The rest of the picture
The AAP lists several other ways to lower the risk: feeding breast milk (the longer, the more protection), keeping your baby away from smoking and vaping before and after birth, regular prenatal care, avoiding alcohol and drugs during pregnancy and after birth, and keeping up with well-child visits, where your baby gets immunizations that evidence suggests may help protect against SIDS. Its list also includes daily tummy time while your baby is awake, which helps motor development and prevents flat head syndrome.
Overheating can increase the risk of SIDS. The AAP says your baby needs only one more layer than you would wear in the same environment, that sweating, a hot chest or flushed skin are signs of overheating, and that your baby should not wear a hat indoors once you are home from the hospital.
The AAP is plain that there is no guaranteed way to prevent SIDS. None of this needs to be a source of anxiety. Get the sleep space right and the rest of parenting has a lot more room for judgement than the internet suggests.
Where the official sources differ
The US and UK guidance agree on the core: back to sleep, a clear sleep space, a separate cot or crib in your room for at least the first 6 months, and never sleeping with your baby on a sofa or armchair. On a few points they differ, and this page states both rather than choosing.
- Bed-sharing. The AAP recommends avoiding it under any circumstances. The NHS says a separate cot or Moses basket is the safest place, and then explains how to share a bed more safely if you do, including a firm, flat mattress, pillows and blankets kept away from your baby, and no swaddling.
- Room temperature. The NHS gives a range of about 16 to 20C. The AAP pages cited here give no number: they say to keep the room at a comfortable temperature and to dress your baby in no more than one extra layer than you would wear.
- How long to room-share. The AAP’s policy summary says at least the first 6 months. Its shorter “9 ways” page says at least 6 months, but preferably up to 1 year. The CDC says ideally until your baby is at least 6 months old.
- Bedside and in-bed sleepers. The AAP’s “9 ways” page says the AAP cannot make a recommendation for or against them until more studies are done. Its policy summary says alternative sleep surfaces, including in-bed sleepers, are a safe option only if they meet the June 2021 CPSC rule.
- Feet to foot. The NHS says to place your baby with their feet at the bottom of the cot, Moses basket or pram. The AAP pages cited here do not mention it.
- Premature babies. The NHS says to follow the safer sleep advice for a year from a premature baby’s due date, not the date they were born. The AAP pages cited here do not mention adjusting for prematurity.
Growing with your baby, week by week
Growbaby adapts to your baby’s age: soothing that reacts to crying in real time, sleep routines for this exact stage, and Growy, an assistant that remembers your child. One subscription covers two caregivers.
Frequently asked questions
Keep placing your baby on their back for every sleep until their first birthday. Once they can roll both ways independently, you do not need to reposition them if they roll on their own during the night. Our guide to rolling over covers when that ability usually arrives.
At the first hint of rolling, not after the first roll. Some babies start working on it as early as 2 months, according to the AAP, and a baby who ends up face-down while wrapped faces a higher suffocation risk. A sleep sack that does not swaddle and lets your baby move freely can be used as long as you want.
The AAP recommends avoiding bed sharing under any circumstances and room-sharing on separate surfaces instead. The NHS also says a separate cot is the safest place, but gives advice on sharing a bed more safely for families who do. Both say never to sleep with your baby on a sofa or armchair, where the AAP puts the risk up to 67 times higher.
No. The AAP, the CPSC and Safe to Sleep all say to keep bumpers and other soft objects out of the sleep space, the CPSC and Safe to Sleep name sleep positioners too, and the AAP says any surface that inclines more than 10 degrees is not safe for sleep. The CPSC’s safe sleep page lists recalls of rocking sleepers and refers to a federal ban on crib bumpers.
No evidence shows that they do. The AAP advises against relying on home cardiorespiratory monitors for SIDS prevention, and finds no evidence that wearable wellness monitors lower the risk either. If you like having one, treat it as an extra, never as a replacement for a baby on their back in a bare crib.
No. The AAP rates lying on the side as no safer than lying face-down, partly because from the side a baby tips onto the front more easily. Safe to Sleep calls the back the safest sleep position, for naps as well as nights.
The AAP says research has not shown when it is 100% safe to have pillows, quilts, comforters or stuffed toys in the crib, but that most experts agree these objects pose little risk to healthy babies after 12 months of age. Before then, layers of clothing or a wearable blanket keep a baby warm without loose bedding.
Sources
- AAP healthychildren.org: How to Keep Your Sleeping Baby Safe, AAP Policy Explained
- NICHD Safe to Sleep campaign
- AAP healthychildren.org: Swaddling, Is it Safe?
- CPSC: Safe Sleep, cribs and infant products
- NICHD Safe to Sleep: Ways to Reduce Baby’s Risk
- AAP healthychildren.org: Safe Sleep, 9 Ways to Reduce a Baby’s Risk of SIDS and Suffocation
- NHS: Sudden infant death syndrome (SIDS)
- CDC: Providing Care for Babies to Sleep Safely
This guide is for general informational purposes only. Growbaby is not a medical device and does not provide medical advice, diagnosis or treatment. Every baby develops at their own pace; for any question or concern about your baby’s health or development, always consult your pediatrician or another qualified healthcare provider.
