Safe Sleep for Babies: The Rules That Actually Matter
By the Growbaby team · Published Aug 3, 2026
Written against AAP, CDC and WHO guidance. How we write these guides
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, ideally 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.
Infant sleep advice contains a great deal of preference and a small core of evidence. This article is about the core: the practices with real outcome data behind them, which are worth following exactly, as distinct from the many decisions where families reasonably differ.
The short version is that the sleep surface matters more than anything you add to it. Most of the recommendations below are variations on a single idea: nothing in the space but the baby, and the baby on their back.
Back to sleep, every time
Place your baby on their back for every sleep, including naps, until their first birthday. Side-lying is not a safe alternative, because it is unstable and babies roll from it into the stomach position.
The rule applies to everyone who ever puts your baby down, which is the part that most often slips. Make sure grandparents, babysitters and daycare know it, since some were raised on advice that has since changed.
Once your baby can roll both ways on their own, you do not have to flip them back through the night. Keep starting every sleep on the back.
The surface and what is on it
Use a crib, bassinet or play yard that meets current safety standards, with a firm and flat mattress and a fitted sheet. Firm means it does not indent under your baby's head. Flat means not inclined; inclined sleepers have been the subject of recalls and are not recommended.
Nothing else belongs in the space. No blankets, pillows, crib bumpers, wedges, positioners, or stuffed toys. For warmth, a wearable blanket or sleep sack does the job without loose fabric. Car seats, swings, bouncers and carriers are not sleep surfaces; if your baby falls asleep in one, move them to the crib when you can.
Room-sharing, not bed-sharing
Sleeping in the same room as your baby, with your baby on their own separate surface, is recommended for at least the first six months. Bed-sharing carries additional risk, and that risk rises sharply with soft bedding, sofas or armchairs, and with any caregiver who smokes or who has consumed alcohol, cannabis or sedating medication.
If there is any chance you will fall asleep while feeding, an adult bed cleared of pillows and blankets is safer than a sofa or an armchair, which are the highest-risk surfaces of all. Move your baby to their own space as soon as you wake.
Swaddling, pacifiers and the rest
Swaddling can help a newborn settle, and it comes with a hard stop: as soon as your baby shows any sign of trying to roll, typically somewhere around 2 to 4 months, swaddling must end, because a swaddled baby who rolls to their stomach cannot push up. The swaddle should be snug across the chest and loose at the hips.
Offering a pacifier at sleep time is associated with lower risk, and there is no need to reinsert it after your baby falls asleep. If you are breastfeeding, the usual suggestion is to wait until feeding is established.
Home cardiorespiratory monitors and wearable baby monitors have not been shown to reduce risk and should not be treated as a substitute for a safe sleep space. They are consumer products, not medical devices.
The rest of the picture
Several other factors carry real evidence: avoiding smoke exposure before and after birth, breastfeeding where possible, keeping up with routine immunisations, avoiding overheating and overdressing, and plenty of supervised tummy time while awake to support development and head shape.
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.
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 the whole family.
Frequently asked questions
When can my baby sleep on their stomach?
Keep placing your baby on their back for every sleep until their first birthday. Once they can roll both ways independently, usually somewhere around 4 to 6 months, you do not need to reposition them if they roll on their own during the night.
When should I stop swaddling?
At the first sign your baby is trying to roll, commonly around 2 to 4 months. A swaddled baby who rolls onto their stomach cannot use their arms to lift their head, which is why this deadline is firm rather than approximate.
Is bed-sharing ever safe?
Current guidance recommends room-sharing on separate surfaces rather than bed-sharing. If you might fall asleep while feeding, an adult bed cleared of pillows and loose bedding is safer than a sofa or armchair, which carry the highest risk. Return your baby to their own space when you wake.
Are crib bumpers, sleep positioners or inclined sleepers safe?
No. Crib bumpers, wedges, positioners and inclined sleepers are not recommended, and several such products have been subject to recalls. The sleep surface should be firm, flat and empty apart from a fitted sheet.
Do baby monitors reduce risk?
There is no evidence that home cardiorespiratory or wearable monitors reduce the risk of sleep-related infant death, and they should not replace a safe sleep environment. They are consumer devices rather than medical equipment.
Sources
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.