Can Newborn Sleep on Their Side Safely? Discover Expert Advice and Proven Practices for Infant Sleep Safety
Understanding Infant Sleep Positions
Newborns have unique sleep needs that are essential for their growth and development. On average, newborns sleep for 14–17 hours in a 24-hour period, but their sleep is divided into shorter bursts of 2–4 hours due to frequent feeding needs.
- Active Sleep (REM): During active sleep, newborns may move their arms and legs, make small noises, or twitch. This lighter sleep stage means they can wake easily.
- Quiet Sleep: In this deeper sleep phase, babies are still, with steady breathing and minimal movement. They are less likely to wake during quiet sleep.
- Sleep Cycles: Each cycle lasts approximately 40 minutes and alternates between active and quiet sleep. At the end of a cycle, infants may briefly wake before settling back to sleep.
Newborns don’t yet have established circadian rhythms, meaning they sleep equally during the day and night. This irregular pattern gradually shifts as they grow older.
Navigating the newborn stage can be challenging, especially when establishing safe sleep habits. Learn more about how to get through this critical phase in our guide on How to Get Through the Newborn Stage.
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Key Takeaways

Why Sleep Position is Critical
The position in which a newborn sleeps directly impacts their safety and health. Parents often wonder, “Can newborn sleep on their side?” The answer is generally no, as side sleeping poses risks that outweigh any perceived benefits.
- Connection to Safety: The safest sleep position for infants under 12 months is on their back. This reduces the risk of Sudden Infant Death Syndrome (SIDS), suffocation, and other sleep-related dangers.
- Breathing and Health: Sleeping on the back ensures that the baby’s airways remain open and unobstructed. Side or stomach sleeping can lead to rebreathing of exhaled air, increasing carbon dioxide levels and reducing oxygen intake.
Common Sleep Positions for Infants
Back Sleeping (Recommended)
Back sleeping is widely recognized as the safest position for infants under 12 months. Since the launch of the “Back to Sleep” campaign in 1994 by the American Academy of Pediatrics (AAP), SIDS rates have dropped significantly.
- Why Back Sleeping is Safest:
- Keeps airways open and reduces suffocation risk.
- Minimizes overheating compared to other positions.
- Benefits:
- Reduces SIDS risk by up to 50%.
- Encourages healthy development without compromising safety.
Side Sleeping
Parents often ask, “Can newborn sleep on their side?” While side sleeping might seem harmless, it carries several risks:
| Side Sleeping Risks | Details |
| Unstable Position | Babies can easily roll onto their stomachs, increasing suffocation risk. |
| SIDS Risk | Side sleeping increases the likelihood of Sudden Infant Death Syndrome. |
| Head Flattening (Plagiocephaly) | Prolonged side sleeping can lead to head shape issues without correction. |
While some parents believe side sleeping helps with reflux or spitting up, there’s no evidence supporting this as a safer alternative.
Side sleeping increases the risk of Sudden Infant Death Syndrome (SIDS), especially when infants accidentally roll onto their stomachs. According to the CDC, placing babies on their back for all sleep times significantly reduces the risk of sleep-related deaths, including SIDS. Learn more about safe sleep practices from the CDC’s guidelines on reducing SIDS risks.
Stomach Sleeping
Stomach sleeping is considered highly unsafe for newborns due to its association with SIDS.
- Risks:
- Increased chance of airway obstruction.
- Potential for rebreathing exhaled air, leading to oxygen deprivation.
- Even if a baby seems more comfortable on their stomach, this position should be avoided until they can roll over independently in both directions (usually around 4–7 months).

Why Sleep Position Matters
Impact on Health & Safety
The position your baby sleeps in plays a critical role in reducing risks such as SIDS and suffocation.
- Back sleeping ensures that the baby’s head remains elevated above their body, preventing accidental airway blockages.
- Studies show that improper positioning—such as side or stomach sleeping—can increase infant death syndrome risk by up to eight times compared to back sleeping.
Developmental Considerations
While back sleeping is safest, it may sometimes lead to minor concerns like flat head syndrome (positional plagiocephaly). However:
- This condition is not life-threatening and can be mitigated with supervised tummy time while awake.
- Side or stomach sleeping does not offer developmental advantages but increases risks like torticollis (neck muscle imbalance).
Expert Recommendations on Infant Sleep
American Academy of Pediatrics (AAP) Guidelines
The AAP provides clear guidelines emphasizing safe sleep practices:
- Always place infants on their backs for every sleep—daytime naps and nighttime rest—until they reach 12 months of age.
- Use a firm mattress in a safety-approved crib free from soft objects like blankets or toys.
- Avoid side or stomach sleeping unless explicitly advised by a healthcare provider for medical reasons.
Other Expert Opinions
Pediatricians and child safety organizations echo these recommendations:
- Back sleeping should become a consistent habit from day one to reduce confusion for caregivers and minimize risks.
- Parents are encouraged to use alternatives like swaddles or sleep sacks instead of allowing unsafe positions like side sleeping.
By following expert guidelines, parents can ensure a safe sleep environment that supports healthy development while minimizing risks associated with unsafe positions.
Risks Associated with Side Sleeping
Sudden Infant Death Syndrome (SIDS)
Side sleeping significantly increases the risk of Sudden Infant Death Syndrome (SIDS), which is a leading cause of death in infants under 12 months. While many parents wonder, “Can newborn sleep on their side?”, the answer is no due to the dangers it poses.
- Increased Risk: Babies placed on their sides can accidentally roll onto their stomachs, which is the most dangerous sleep position. Stomach sleeping can obstruct airways and impair breathing.
- Rebreathing Risks: Side sleeping can lead to rebreathing of exhaled air, causing a buildup of carbon dioxide and reduced oxygen intake. This condition can result in hypoxia, a potentially fatal situation where the baby’s brain fails to signal them to wake up.
The safest sleep position for infants is on their back, as recommended by safe sleep guidelines from organizations like the American Academy of Pediatrics (AAP).
Sudden Infant Death Syndrome is a major concern for new parents, and understanding safe sleep practices is crucial. For more advice tailored to new moms, check out 20 Life-Changing Gentle Parenting Tips for New Moms.
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Risks of Torticollis
Torticollis, or “wry neck,” is another potential risk associated with prolonged side sleeping. This condition results from an imbalance in neck muscles and can affect your baby’s comfort and development.
| Signs of Torticollis | Details |
| Head tilts consistently to one side | Baby prefers turning their head in one direction. |
| Limited neck mobility | Difficulty turning their head fully or resistance to movement. |
| Uneven muscle development | Stiffness or tightness in neck muscles due to prolonged positioning. |
If these signs are noticed, consult a pediatrician for advice. Physical therapy or simple neck exercises can often resolve the issue.
Suffocation Hazards
Side sleeping increases the risk of suffocation due to improper positioning and potential entrapment.
- Airway Blockage: Babies sleeping on their sides may roll onto soft bedding, pillows, or blankets, blocking their airways.
- Entrapment Risks: Loose crib items like bumpers or toys can trap a baby’s face if they shift positions during sleep.
How to Reduce Suffocation Risks:
- Use a firm mattress with a tightly fitted sheet.
- Keep the crib free from soft objects like blankets, pillows, or stuffed toys.
- Always place your baby on their back for sleep.
Safe Sleep Practices for Infants
Importance of a Firm Sleep Surface
A firm sleep surface is essential for reducing risks associated with unsafe sleep positions.
- Characteristics of a Safe Mattress:
- Firm and flat to support proper alignment.
- Covered with a tightly fitted sheet.
- Free from soft objects that could pose suffocation risks.
- Why Firmness Matters:
- Prevents sinking into the mattress, which could obstruct breathing.
- Supports healthy spine development during early months.
Avoid using inclined sleepers or wedges as they increase suffocation risks and are not recommended by pediatricians.
Using a firm, flat sleep surface is essential for reducing suffocation risks and promoting safe sleep. The American Academy of Pediatrics recommends placing infants on a firm mattress in a safety-approved crib to minimize hazards. Explore detailed recommendations from the AAP’s updated safe sleep guidelines.

Establishing Back Sleeping Habits
Encouraging back sleeping is vital for newborn safety. While some parents worry about choking risks when babies spit up while lying on their backs, studies confirm that back sleeping actually reduces choking risks due to natural reflexes that clear airways.
Tips for Promoting Back Sleeping:
- Swaddle your baby securely to prevent rolling onto their side or stomach.
- Use a sleep sack as an alternative to blankets for warmth without suffocation risks.
- Place your baby in the crib on their back consistently to establish this habit early.
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Dealing with Natural Shifts to Side Sleeping
As babies grow, they may naturally roll onto their sides during sleep. Here’s how to manage this transition safely:
- What To Do:
- If your baby rolls onto their side before reaching developmental milestones (around 4–7 months), gently reposition them onto their back.
- Stop swaddling once your baby begins rolling over independently to avoid entrapment hazards.
- Monitoring Strategies:
- Use a baby monitor to track movements during sleep.
- Check periodically to ensure your baby remains in a safe position.
Tips for Monitoring Sleep Position
Monitoring your baby’s sleep position helps ensure safety throughout the night:
- Invest in a reliable baby monitor with motion detection features to alert you if your baby rolls onto their side or stomach.
- Perform regular checks during naps and nighttime sleep to confirm they remain on their back.
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When Side Sleeping Becomes Safer
Side sleeping becomes safer once your baby reaches key developmental milestones:
| Milestone | Age Range (Months) |
| Rolling both ways (tummy-to-back and back-to-tummy) | Typically between 4–7 months. |
| Strengthened neck muscles | Allows independent head lifting and turning during sleep. |
Even after these milestones are reached, always place your baby on their back initially before allowing them to find their preferred position during sleep.
Alternatives to Side Sleeping
Benefits of Swaddling
Swaddling helps newborns feel secure while maintaining safe back sleeping positions. It prevents sudden movements that might cause them to roll onto unsafe positions.
Transitioning Out of Swaddling:
Once your baby begins rolling over, switch to alternatives like sleep sacks for continued safety without restricting mobility.
Using Sleep Sacks
Sleep sacks are wearable blankets designed for warmth and safety:
- Provide comfort while eliminating suffocation risks associated with loose bedding.
- Encourage secure back sleeping habits by limiting excessive movement during sleep.
Role of Sleep Positioners: Pros and Cons
While some parents consider using wedges or pillows as sleep aids, these products are generally discouraged:
- Cons:
- Increase suffocation risk due to soft materials.
- Do not prevent SIDS effectively despite marketing claims.
- Instead, opt for safe solutions like firm mattresses and wearable blankets.

Creating an Optimal Sleep Environment
Importance of Room Temperature
Maintaining an ideal room temperature between 68–72°F (20–22°C) prevents overheating—a known risk factor for SIDS—and ensures your baby sleeps comfortably.
How To Monitor Temperature:
- Use a thermometer or a baby monitor equipped with temperature sensors.
- Dress your baby in breathable layers like footed pajamas or sleep sacks based on room conditions.
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Final Thoughts
Back sleeping remains the safest position for newborns under 12 months. By following expert guidelines and creating an optimal sleep environment—free from hazards like side sleeping—you can reduce risks such as SIDS and suffocation while ensuring restful nights for both you and your little one. Always consult your pediatrician if you have concerns about safe sleep practices.

