To lower the risk of SIDS and suffocation, place your newborn on their back for every sleep, on a firm, flat surface made for babies, in a completely bare space with nothing loose, in your room but not your bed. These are the core safe-sleep rules, and they apply to every nap and every night from day one.
This guide is the dedicated safe-sleep rulebook: what each rule is and why it matters. For the wider picture — how much newborns sleep, schedules, and settling — see the complete newborn sleep guide linked below.
What “safe sleep” means — and why the rules exist
Safe sleep is a short set of habits, backed by the AAP, Mayo Clinic, and the NHS, that lower two real risks for babies under one year: SIDS (sudden infant death syndrome) and accidental suffocation or strangulation during sleep. The rules work together — no single one is optional — and they are the same for naps and nighttime, every time your baby sleeps and whenever someone else is caring for your baby.
Always place your baby on their back
Put your baby down to sleep on their back — not the side, not the stomach — for every nap and every night. Back sleeping keeps the airway clearest and is the single most protective safe-sleep habit; the side position is unsafe because babies easily roll from it onto the stomach. Babies do not choke more often on their backs — a healthy baby’s airway clears fluid in this position. Keep starting your baby on the back until their first birthday.
Choose a firm, flat sleep surface
Your baby needs a firm, flat surface made for infant sleep: a crib, bassinet, or portable cot with a firm mattress and a snug fitted sheet, and nothing else on it. Avoid any inclined or wedge-shaped sleeper, and do not let your baby routinely sleep in a car seat, swing, bouncer, or nursing pillow — an incline or soft, curved surface can let a newborn’s head drop forward and block the airway. If your baby falls asleep in one, move them to a flat surface as soon as you can.
Keep the sleep space completely bare
A safe sleep space is a bare one. Keep out pillows, loose blankets, quilts, crib bumpers, positioners, wedges, and soft toys — all can cover a baby’s face or trap them and raise the suffocation risk. Your baby needs only the firm mattress and a fitted sheet, and nothing should prop them up or restrain them. If it is not the mattress, the sheet, your baby, and (optionally) a sleep sack, it does not belong in the sleep space.
Dress for warmth without loose bedding
Because loose blankets are unsafe, use a wearable blanket or sleep sack for warmth instead — it keeps your baby cozy without anything that can ride up over the face. Dress your baby in about one light layer more than you are comfortable wearing, and keep the room comfortable. Do not overheat your baby — overheating is a known SIDS risk factor. Signs of being too warm include sweating, damp hair, or a hot chest. Skip hats indoors during sleep, and never add layers on top of a sleep sack.
Room-share, but don’t bed-share
Keep your baby’s sleep surface in your room, close to your bed, ideally for the first 6 months — this room-sharing is linked to a lower SIDS risk and makes night feeds easier. But your baby should sleep on their own separate firm, flat surface, not in your bed. Adult beds bring risks of suffocation, entrapment, and overheating, and sofas or armchairs are the most dangerous of all — never fall asleep with your baby on one.
Smaller habits that lower the risk further
A few extra habits stack on top of the core rules. Keep your baby’s environment completely smoke-free — at home and in the car — as smoke exposure raises SIDS risk. Offering a pacifier at naps and bedtime, once feeding is established, is associated with a lower risk of SIDS; never attach it to a cord or clip. Breastfeeding, when it works for your family, is also linked to a lower risk, as is keeping up with routine well-baby visits and immunizations.
Tummy time is for awake time only — never sleep
Tummy time builds neck and shoulder strength, but it is awake and supervised only. Never place your baby on their stomach to sleep, and never leave a baby unsupervised on their tummy. Do a few minutes at a time on a firm surface while you watch and your baby is alert. The moment your baby drifts toward sleep, move them onto their back on their safe sleep surface.
A quick safe-sleep check before every sleep
Run through the essentials each time you put your baby down:
- Baby is on their back
- A firm, flat crib, bassinet, or portable cot with a fitted sheet
- Nothing loose — no pillows, blankets, bumpers, or toys
- A sleep sack for warmth instead of a blanket; baby not overheated
- Baby’s own surface, in your room, not your bed; the room smoke-free
When to get help
Safe-sleep habits reduce risk; they do not replace watching your baby. Use these tiers, and trust your instincts — when in doubt, call.
Emergency — call 911 now: your baby is not breathing or has a breathing pause longer than 10 seconds; lips, face, or tongue look blue or dusky; your baby is limp, unresponsive, or will not wake. Start infant CPR if you are trained and call for help immediately.
Same-day — call your pediatrician: your baby is feeding poorly, has fewer wet diapers than usual, seems unusually sleepy or hard to rouse, or you have any worry about how they are breathing or sleeping.
Noisy but normal: newborns often grunt, snort, sigh, twitch, and breathe in an irregular pattern with brief pauses during sleep — this is usually normal. But this never overrides your instincts: if something feels wrong, call.
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Frequently asked questions
Where should a newborn sleep?
Your newborn should sleep alone, on their back, on a firm, flat surface made for infant sleep — a crib, bassinet, or portable cot with a firm mattress and a fitted sheet. Keep that space bare and in your room, next to your bed, ideally for the first 6 months. That is the safest place for every nap and every night.
Are sleep sacks safe for newborns?
Yes. A wearable blanket or sleep sack keeps your baby warm without riding up over the face the way a loose blanket can. Choose one sized for your baby's weight, put your baby down on their back, and skip loose blankets. Do not add extra layers on top — overheating is itself a SIDS risk factor.
Is it safe to bed-share with a newborn?
The safest arrangement is room-sharing without bed-sharing: your baby sleeps on their own separate firm, flat surface in your room, not in your bed. Adult beds carry risks of suffocation, entrapment, and overheating, and sofas and armchairs are the most hazardous of all — never sleep with your baby on one.
When can my baby sleep on their stomach?
Place your baby on their back for every sleep until their first birthday. Once a baby can reliably roll both ways on their own, they may settle into another position and you need not keep flipping them back — but always start them on their back and keep the space bare. Never intentionally put a young baby down to sleep on the stomach or side.
Does a pacifier reduce the risk of SIDS?
Offering a pacifier at naps and bedtime is associated with a lower risk of SIDS once feeding is established (often around 3–4 weeks for breastfed babies). Never attach it to a cord or clip, which is a strangulation hazard. If it falls out after your baby is asleep, you do not need to put it back, and if your baby refuses it, that is fine.
Medical disclaimer: This article is for general information and is not a substitute for professional medical advice, diagnosis, or emergency care. Safe-sleep guidance can change and individual situations vary — always follow your own pediatrician’s advice for your baby. If your baby shows any emergency sign, call your pediatrician or emergency services immediately — do not delay. Read our full medical disclaimer.
Written by the Babbez Editorial Team. Sources: American Academy of Pediatrics (AAP), Mayo Clinic, NHS.