Put your baby to sleep on their back for every sleep period — naps and nighttime alike. This is the single most important thing you can do to lower the risk of sudden infant death syndrome (SIDS) and other sleep-related deaths. Place them on a firm, flat surface with no loose bedding, and keep the sleep space clear of toys, pillows, and bumpers.
The back-sleeping recommendation is not a style preference. It comes from decades of research and has been tied to a major drop in infant deaths since the 1990s. What follows covers how to position your baby, what to avoid, and the questions parents ask most.
Why Does Back Sleeping Matter So Much?
Babies who sleep on their stomachs have a higher risk of SIDS than babies who sleep on their backs. This finding has held up across many studies and populations, and it is the reason health agencies worldwide recommend back sleeping for infants.
SIDS is the sudden, unexplained death of a baby younger than one year, usually during sleep. Researchers do not fully understand what causes it. The leading explanation is that some infants have a vulnerability — in brain regions that control breathing and waking — that combines with a trigger, such as sleeping face-down or rebreathing their own exhaled air. Back sleeping appears to reduce that risk.
When a baby sleeps on their stomach, they may breathe in air they just exhaled, which is higher in carbon dioxide and lower in oxygen. They also may not wake as easily when their breathing is stressed. Back sleeping keeps the airway open and makes it easier for a baby to arouse if something goes wrong.
Since back-sleeping campaigns began in the 1990s, infant deaths during sleep have fallen sharply. That is strong evidence, even though no single study can prove cause and effect for every case.
How Do You Position A Baby For Sleeping Safely?
Lay your baby flat on their back on a firm sleep surface. Their face should be up, not turned into the mattress. Keep their head and face uncovered.
Place them with their feet near the foot of the crib. This “feet to foot” position keeps them from sliding down under blankets — though blankets should not be in the crib at all for infants.
Use a firm mattress with a tight-fitting sheet. A mattress is firm enough if it does not indent when your baby lies on it. Soft mattresses and memory foam are not safe for infant sleep.
Once your baby can roll both ways on their own — usually around 4 to 6 months — they may roll onto their stomach during sleep. You do not need to keep flipping them back. At that point, they have the strength and coordination to change position themselves. Still start every sleep on the back.
What Should Be In The Crib — And What Should Not?
An empty crib is the safe crib. The only things that belong in an infant’s sleep space are a firm mattress and a tight sheet.
Keep these out of the sleep area:
- Pillows, including nursing pillows and positioners
- Blankets, quilts, and comforters
- Bumper pads of any kind
- Stuffed animals and toys
- Sleep wedges and inclined positioners
These items can block a baby’s airway or cause them to overheat. Inclined sleepers and positioners have been linked to infant deaths and have been recalled or banned in the US. Flat is safer than angled.
If you are worried about your baby getting cold, use a wearable blanket or sleep sack instead of a loose blanket. Dress them in one layer more than you would wear to feel comfortable in the same room.
Is Tummy Time Still Needed?
Yes. Tummy time is important — just not during sleep.
Supervised tummy time while your baby is awake and you are watching helps build neck, shoulder, and arm strength. It also helps prevent flat spots on the back of the head, which can develop when babies spend too much time on their backs.
Start with short sessions a few times a day and build up as your baby gets stronger. Always stay with them. Tummy time is not a sleep position.
Does Room-Sharing Lower The Risk?
Yes. The American Academy of Pediatrics recommends that babies sleep in the same room as parents — but in their own separate sleep space — for at least the first 6 months, and ideally up to 1 year.
Room-sharing means your baby is nearby, which makes it easier to feed, comfort, and monitor them. It does not mean bed-sharing. The AAP advises against bed-sharing because it raises the risk of SIDS and accidental suffocation, especially with soft bedding, on a couch or armchair, or if a parent smokes, drinks, or takes sedating medication.
Some parents choose bed-sharing for feeding or cultural reasons. If you do, talk to your pediatrician about how to lower the risks. The safest place for a baby to sleep is on a separate, firm surface in your room.
What About Swaddling And Pacifiers?
Swaddling can help calm a newborn, but it must be done safely. Swaddle snugly around the arms and torso, never tightly around the hips, and always place the swaddled baby on their back.
Stop swaddling as soon as your baby shows signs of trying to roll over — often around 2 to 3 months. A swaddled baby who rolls onto their stomach may not be able to roll back, which raises the risk of suffocation. Once rolling starts, switch to a sleep sack.
Offering a pacifier at sleep time is associated with a lower risk of SIDS in some studies. If you are breastfeeding, many clinicians suggest waiting until breastfeeding is well established before introducing one. If the pacifier falls out during sleep, you do not need to put it back.
Does Sleep Position Change As Babies Grow?
Back sleeping is recommended for the entire first year. This is true even after your baby can roll over on their own.
Once a baby can roll both directions, they may choose their own sleep position. You do not need to reposition them. What matters is that you always place them down on their back at the start of sleep.
After the first birthday, the risk of SIDS drops dramatically. At that point, most toddlers can sleep in whatever position they find comfortable, and a light blanket and small pillow may be introduced — though many parents wait longer.
| Age | Sleep Position | Key Point |
|---|---|---|
| 0–12 months | Always on the back | Every sleep, every time |
| Rolling both ways | Start on back, let them roll | No need to flip back |
| After 1 year | Any comfortable position | Risk drops sharply |
Common Mistakes That Raise The Risk
Even parents who know the back-sleeping rule sometimes slip. A few common ones:
- Letting a baby nap in a car seat, swing, or bouncer for long periods
- Falling asleep with a baby on a couch or armchair
- Using a positioner or wedge to keep a baby on their side
- Adding a blanket “just for tonight”
- Placing a baby on their stomach “just to settle them”
Side sleeping is not a safe middle ground. Babies placed on their side can roll onto their stomach more easily than they can roll back.
If your baby falls asleep in a car seat or swing, move them to a firm, flat surface as soon as you can. These devices are not designed for unsupervised sleep.
When To Talk To Your Pediatrician
Some babies have conditions that affect sleep positioning — for example, severe reflux, a breathing problem, or a medical device. In rare cases, a doctor may recommend a different position. Never make that change on your own.
If your baby seems to struggle to breathe, turns blue, or has repeated breathing pauses during sleep, seek medical care right away. These are not normal and need evaluation.
If you are exhausted and worried about falling asleep while holding your baby, tell your pediatrician. There are strategies to help, and asking is not a sign of failure.
Frequently Asked Questions
What is the safest sleep position for a baby?
On the back, on a firm, flat surface, for every sleep. This is the position linked to the lowest risk of SIDS and sleep-related death.
Can a baby sleep on their side?
No. Side sleeping is not safe because babies can roll onto their stomach more easily from their side than they can roll back.
What if my baby rolls onto their stomach during sleep?
Once your baby can roll both ways on their own, you do not need to flip them back. Always start sleep on the back, but let them choose their position after that.
When can a baby sleep with a blanket or pillow?
Most experts advise waiting until after the first birthday, when the risk of SIDS drops sharply. Before then, use a wearable blanket instead.
