Bedsharing with a newborn carries real risks, but many families end up doing it, whether by choice or out of exhaustion. The American Academy of Pediatrics recommends that infants sleep on their backs in their own sleep space with no other people. That said, organizations like the Academy of Breastfeeding Medicine and La Leche League International recognize that if parents are going to bedshare, following specific safety criteria can significantly reduce the danger. Here’s what you need to know to make it as safe as possible.
Why Newborns Under 4 Months Are Highest Risk
Even under ideal conditions, bedsharing with a healthy, full-term newborn younger than 4 months carries 5 to 10 times the baseline risk of sleep-related infant death, according to AAP data. This is true even when neither parent smokes and the baby is breastfed. Babies born preterm or at low birth weight face 2 to 5 times the baseline risk regardless of age. These numbers don’t mean bedsharing is guaranteed to be dangerous, but they do mean the youngest newborns are the most vulnerable, and every precaution matters more during this window.
The Conditions That Must Be Met
La Leche League International developed a framework often called the “Safe Sleep Seven” to help breastfeeding parents reduce bedsharing risks. The core idea is that certain conditions need to all be true at once. If any one of them is missing, the risk climbs sharply.
The parent sharing the bed should be:
- A nonsmoker. A meta-analysis in The Journal of Pediatrics found that bedsharing with a mother who smokes raises the risk of sudden infant death more than sixfold. For nonsmoking mothers, the increase was much smaller and not statistically significant.
- Sober. No alcohol, sedating medications, or drugs. These substances impair your ability to sense and respond to your baby during sleep. Even one drink counts.
- Breastfeeding. Breastfeeding mothers naturally adopt a protective sleep position (more on that below) and tend to be more responsive to their baby’s movements and breathing during sleep. Formula-fed babies face higher risk during bedsharing.
The baby should be:
- Healthy and full-term. Premature babies or those with low birth weight are more vulnerable to breathing difficulties in an adult bed.
- Placed on their back. Never on their stomach or side.
- Lightly dressed. No swaddle blankets, no heavy sleepwear. Light clothing helps prevent overheating, which is an independent risk factor for SIDS.
The Cuddle Curl Position
Breastfeeding mothers around the world instinctively adopt the same sleeping posture next to their babies. The Academy of Breastfeeding Medicine calls it the “C-position” or “cuddle curl,” and it’s the safest way to position yourself if you’re bedsharing.
You lie on your side facing the baby, with your lower arm above the baby’s head. This prevents the baby from scooting up into the pillows. Your knees tuck up beneath the baby’s feet, blocking them from sliding down the bed. Your body essentially forms a protective C-shape around the infant, creating a pocket of space where the baby lies flat on their back, at breast level, away from pillows and blankets. This position makes it very difficult for you to roll onto the baby or for the baby to move into a dangerous spot.
Setting Up the Bed
The sleep surface itself matters as much as your positioning. A firm, flat mattress is essential. Memory foam, pillow-top mattresses, and waterbeds create soft pockets that can conform around a baby’s face and obstruct breathing. The U.S. Consumer Product Safety Commission requires infant sleep surfaces to be angled no more than 10 degrees from horizontal, which gives you a sense of how flat the surface needs to be.
Strip the bed down to basics. Remove extra pillows, stuffed animals, and heavy comforters. Keep your own pillow well above the baby’s head, and use a lightweight blanket pulled only to your waist, well below the baby’s face. No strings, cords, or anything that could wrap around the baby’s neck should be near the sleep area.
The mattress should sit directly on the floor or on a solid bed frame with no gaps between the mattress and headboard, footboard, or wall. Babies can become trapped in spaces as narrow as a few inches. If your bed frame has slats, rails, or any openings, push the mattress against a solid wall or move it to the floor entirely. Never bedshare on a couch, recliner, or armchair. Research consistently shows that falling asleep with a baby on a sofa carries an especially high risk of suffocation.
Room Temperature and What to Dress Baby In
Overheating is a known risk factor for SIDS, and sharing a bed naturally adds warmth from your body. Keep the room between 68°F and 72°F. Dress the baby in a single light layer, like a onesie or a lightweight sleeper. If the room runs cooler, a sleep sack rated at 1.0 TOG (a measure of thermal resistance in fabric) works for rooms between 68°F and 75°F. For warmer rooms, above 75°F, a 0.2 TOG layer or just a diaper and light onesie is enough. Skip hats indoors, since babies release excess heat through their heads.
Who Should Not Bedshare
Some situations make bedsharing dangerous regardless of other precautions. Do not bedshare if:
- Either parent smokes, even if you never smoke in bed. Chemicals on skin and clothing still affect the baby.
- You’ve consumed any alcohol or taken sedating medication, including antihistamines and some antidepressants.
- You’re extremely sleep-deprived to the point of impairment (which, admittedly, describes most new parents, making the next option worth considering).
- The baby was born premature or at low birth weight.
- Another child or pet is also in the bed.
- The other adult in the bed is not the baby’s parent or is not aware the baby is there.
Bedside Bassinets as a Middle Ground
If bedsharing feels too risky but you want your baby within arm’s reach, a bedside sleeper offers a compromise. These are bassinets that attach directly to the side of your adult bed, with a drop-down wall that lets you reach the baby without getting up. The CPSC regulates these products under specific safety standards, requiring them to meet bassinet and cradle requirements for firmness, gap size, and secure attachment to the adult bed.
A bedside sleeper gives you the closeness and easy nighttime breastfeeding access that draws many parents to bedsharing, while keeping the baby on their own firm, flat surface. If you find yourself dozing off during nighttime feeds, having the bassinet right there makes it easier to place the baby back in their own space.
Planning for Unintentional Bedsharing
Many parents who never planned to bedshare end up doing it out of sheer exhaustion, falling asleep during a 3 a.m. feeding in bed. This unplanned bedsharing, often on a couch or in a bed still cluttered with pillows and blankets, tends to be the most dangerous kind. If there’s any chance you might fall asleep while feeding, it’s safer to prepare your bed in advance as if you were planning to bedshare: firm mattress, minimal bedding, baby positioned at breast level, no other children or pets in the bed. Falling asleep in a prepared bed is far safer than falling asleep on a sofa with a baby on your chest.