No, it is not okay for newborns to sleep on their stomach. The American Academy of Pediatrics recommends that all infants be placed on their back for every sleep, by every caregiver, until their first birthday. Stomach sleeping is one of the strongest known risk factors for sudden infant death syndrome (SIDS), roughly tripling the odds compared to back sleeping.
Why Stomach Sleeping Is Dangerous
When a newborn sleeps face down, several things can go wrong at once. The most well-studied risk is rebreathing, where a baby inhales their own exhaled air. Carbon dioxide pools in the small pocket of space between the baby’s face and the mattress surface, and the baby ends up breathing in less and less oxygen with each breath. Healthy older children and adults would wake up and turn their head. Newborns, especially in the first few months, have immature arousal reflexes and may not respond in time.
Stomach sleeping also makes it harder for a baby’s body to shed heat. Research on infant thermoregulation found that the heat loss rate for a prone baby is about 60% lower than for one sleeping on their back, because less of the head and limbs are exposed to open air. Abdominal skin temperature runs 0.3 to 0.7°C higher in the prone position. While this alone may not cause dangerous overheating, it compounds the other risks: studies show prone sleeping leads to longer sleep cycles, more time in deep sleep, and higher arousal thresholds, all of which make it harder for a baby to wake up when something is wrong.
How Much the Risk Increases
A large systematic review covering more than 59,000 infants found that back sleeping cuts the odds of SIDS by about half compared to all other positions. When stomach sleeping was compared directly to back sleeping, the estimated odds ratio was roughly 3.2, meaning stomach sleepers faced more than three times the risk. A separate meta-analysis placed the odds ratio even higher, at 4.46.
These numbers drove one of the most successful public health campaigns in recent history. Before the AAP issued its first safe sleep recommendation in 1992, the SIDS rate in the United States was about 130 deaths per 100,000 live births. By 1999, after the “Back to Sleep” campaign gained traction, that rate had dropped to roughly 67 per 100,000, a decline of nearly 50% in under a decade. The single biggest change during that period was parents placing babies on their backs instead of their stomachs.
What About Choking?
Many parents worry that a baby sleeping on their back will choke on spit-up. This concern is understandable but not supported by evidence. The AAP states directly that back sleeping on a flat surface does not increase the risk of choking or aspiration, even in babies with reflux. Healthy newborns have a natural gag reflex and airway anatomy that help them swallow or cough up liquid when lying on their back. In fact, the trachea (airway) sits above the esophagus (food pipe) in the supine position, so gravity actually works in the baby’s favor by keeping regurgitated milk away from the airway.
When Babies Start Rolling Over
The back-only rule has a practical endpoint: once your baby can roll both ways, from back to stomach and from stomach to back, you can let them stay in whatever position they choose after you put them down on their back. Most babies reach this milestone somewhere between 4 and 6 months, though some get there earlier.
If your baby can only roll one direction, say from back to stomach but not back again, you should reposition them onto their back when they flip over during sleep. This is also the point where swaddling needs to stop. A swaddled baby who rolls onto their stomach has no free arms to push up or turn their head, which significantly raises the suffocation risk. The moment you see any signs of your baby attempting to roll, it is time to switch from a swaddle to a wearable sleep sack that leaves the arms free.
Supervised Tummy Time Instead
Babies still need time on their stomachs to build the neck, shoulder, and core strength that eventually lets them roll, crawl, and sit. The key distinction is that tummy time happens while the baby is awake and you are watching. Starting in the first weeks of life, aim for two to three short sessions a day, about 3 to 5 minutes each. By around 7 weeks, you can gradually work up to 15 to 30 minutes total per day.
Tummy time also helps prevent flat spots on the back of the skull (positional plagiocephaly), which can develop when babies spend long stretches lying in the same position. Doing tummy time on your chest, across your lap, or on a firm surface on the floor all count.
Other Safe Sleep Basics
Sleep position is the single most important factor, but it works best alongside a few other practices. Your baby should sleep on a firm, flat mattress with a fitted sheet and nothing else in the crib: no pillows, blankets, bumper pads, stuffed animals, or positioning devices. Products marketed as anti-suffocation surfaces or “SIDS prevention” devices have not been shown to reliably prevent carbon dioxide buildup, and some may create a false sense of security.
Side sleeping is also not considered safe. The AAP explicitly advises against it because babies placed on their side can easily roll onto their stomach. Room sharing without bed sharing, where the baby sleeps on a separate surface in the same room as you, is recommended for at least the first six months.