Safe Sleep Position: Back Sleeping for Babies
The short answer
Placing your baby on their back for every sleep, including naps, is the single most important action to reduce the risk of SIDS (Sudden Infant Death Syndrome). The "Back to Sleep" campaign has reduced SIDS deaths by over 50% since its introduction. Babies should sleep on their backs until they can roll both ways on their own, typically around 4-6 months. Healthy babies are not more likely to choke when sleeping on their backs.
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By Age
What to expect by age
0-3 months
Always place your baby on their back on a firm, flat surface for every sleep. Use a safety-approved crib, bassinet, or play yard with a tight-fitting sheet and nothing else in the sleep space - no pillows, blankets, bumpers, stuffed animals, or positioners. The ABCs of safe sleep are: Alone, on their Back, in a Crib. Many parents worry that back sleeping increases choking risk, but babies have a natural gag reflex and airway anatomy that protects them. Back sleeping is safer even for babies with reflux.
3-6 months
Continue placing your baby on their back at the start of every sleep. Around 4-6 months, many babies learn to roll over. Once your baby can roll both ways (back to tummy and tummy to back) independently, you do not need to reposition them if they roll to their stomach during sleep. However, always start them on their back. This is also a good time to stop swaddling, as a swaddled baby who rolls to their stomach is at increased risk. Transition to a sleep sack.
6-12 months
Continue starting your baby on their back for sleep even though they may roll to their preferred position. By this age, most babies have developed the strength and coordination to move their head and body if their airway becomes obstructed. The sleep space should still be free of loose bedding, pillows, and soft toys. The risk of SIDS decreases after 6 months but remains present until 12 months, so safe sleep practices should continue.
What Should You Do?
When to take action
- Your baby sleeps peacefully on their back and you start them in this position for every sleep.
- Your baby has learned to roll both ways and sometimes ends up on their stomach during sleep.
- Your baby initially fusses when placed on their back but settles within a few minutes.
- Your baby strongly resists back sleeping and you are struggling to follow safe sleep guidelines.
- A caregiver, family member, or cultural practice conflicts with back sleeping recommendations.
- Your baby has a medical condition and you are unsure if back sleeping is appropriate.
- You find your baby face-down in soft bedding, pillows, or a gap between surfaces and they are not moving.
- Your baby is sleeping in an unsafe location like a couch, recliner, or adult bed and cannot be moved without waking.
- Your baby stops breathing, turns blue, or becomes limp during sleep.
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
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Related Sleep Concerns
SIDS Risk Reduction Checklist for Parents
SIDS (Sudden Infant Death Syndrome) risk can be significantly reduced by following evidence-based safe sleep practices. The most important steps include placing your baby on their back for every sleep, using a firm flat sleep surface with no loose bedding, room-sharing without bed-sharing, breastfeeding, offering a pacifier at sleep time, and avoiding smoke exposure. SIDS risk peaks between 2-4 months and most cases occur before 6 months of age.
My Baby Rolls Face Down in Sleep
Once your baby can roll from back to tummy and tummy to back independently, it's safe to let them find their preferred sleep position, even if it's face down. Always place your baby on their back to start sleep, but if they roll over on their own, you don't need to keep repositioning them.
Ideal Room Temperature for Baby Sleep
The ideal room temperature for baby sleep is between 68-72F (20-22C). Overheating is a known risk factor for SIDS, so it is important to keep the room comfortably cool. Dress your baby in one layer more than you would wear, and avoid heavy blankets, hats, and excessive bundling. Feel the back of your baby's neck or chest to check if they are too warm or too cool.
When and How to Stop Swaddling Your Baby
You should stop swaddling your baby at the first sign of rolling over, which typically occurs around 3-4 months, though some babies roll as early as 2 months. A swaddled baby who rolls to their stomach is at increased risk of suffocation because their arms are restrained. Transition to a wearable blanket (sleep sack) that allows free arm movement. The transition can be done gradually (one arm out, then both) or all at once.
How Long Should Baby Be Awake Between Naps?
The ideal awake time between naps (called a "wake window") increases as your baby grows. Newborns may only handle 45-90 minutes awake, while toddlers can manage 4-6 hours. Getting wake windows right is one of the most effective ways to improve nap quality, because both too-short and too-long wake times lead to poor sleep.
Is a Bath Before Bed Really Necessary?
A nightly bath is not medically necessary and some babies with sensitive skin do better with less frequent bathing. However, a warm bath can be a powerful sleep cue because the subsequent body temperature drop triggers melatonin production. If you include a bath, keep it calm and warm rather than stimulating.