Co-Sleeping Safety - Risks and Guidelines
The short answer
The AAP recommends room-sharing (baby sleeps on their own surface in the same room) but not bed-sharing for the first year. Bed-sharing increases the risk of SIDS and suffocation, especially in the first 4 months, with premature babies, when parents smoke, drink, or take sedating medications, and on soft surfaces. Many families do end up bed-sharing at some point - if you choose to or find yourself doing so, knowing the risk factors and how to reduce them is important for your baby's safety.
By Age
What to expect by age
The first 4 months carry the highest risk for bed-sharing-related infant deaths. The safest arrangement is a bassinet or crib next to your bed where you can see, hear, and reach your baby easily without sharing the same sleep surface. If you are breastfeeding and worried about falling asleep during feeds, prepare your bed as if you planned to bed-share: firm mattress, no pillows or blankets near baby, no gap between mattress and headboard. This way, if you doze off, the environment is as safe as possible.
Risk decreases after 4 months but bed-sharing still carries elevated risk compared to a separate sleep surface. Room-sharing continues to be the recommended arrangement. If you bed-share, the "Safe Sleep Seven" guidelines (from a breastfeeding-supportive perspective) suggest that risk is lowest when: the mother is breastfeeding, is a non-smoker, is sober, baby is on their back on a firm mattress with no pillows or blankets near them, and baby is healthy and full-term. The AAP still recommends against bed-sharing at any age in the first year.
As babies become stronger and more mobile, some risks of bed-sharing decrease (they can turn their head and push away from obstructions), but other risks emerge (rolling off the bed, getting trapped between mattress and wall). Continue room-sharing if possible. If you are ready to transition baby to their own room, many families find this easier after 6 months. Ensure the crib meets current safety standards and the room is child-proofed.
After 12 months, SIDS risk is extremely low. Bed-sharing with a toddler is a personal family choice. Many cultures worldwide practice family co-sleeping through toddlerhood and beyond. If your toddler co-sleeps, ensure the bed is safe: firm mattress on the floor or with guardrails, no gaps where your child could become trapped, no heavy blankets or soft pillows near young toddlers. Transitioning to an independent sleep arrangement can happen whenever your family is ready.
What Should You Do?
When to take action
- Your baby sleeps in a bassinet or crib in your room for the first 6-12 months (recommended room-sharing)
- You sometimes doze briefly during nighttime nursing and want to make your bed safer
- Your toddler over 12 months occasionally ends up in your bed after a nightmare or illness
- You choose to room-share beyond 12 months because it works for your family
- You are regularly falling asleep unintentionally while feeding your baby in bed and want guidance on safer practices
- You want to transition your baby from your bed to a crib but are struggling with the process
- You are co-sleeping because your baby refuses all other sleep arrangements and you need help finding alternatives
- Your baby is sleeping on a couch, recliner, or other soft surface with an adult - move them to a firm flat surface immediately. These are the most dangerous sleep environments.
- Anyone who has consumed alcohol, taken sedating medications, or smoked is sleeping in the same bed as the baby
- Your baby is found face-down in soft bedding and is not responsive or is having difficulty breathing - call 911
Sources
Related Resources
Related Sleep Concerns
SIDS Risk Factors and Safe Sleep
SIDS is the unexplained death of a baby under 1 year old during sleep. While the exact cause remains unknown, the risk can be significantly reduced by following safe sleep practices: always place your baby on their back, on a firm flat surface, with no loose bedding, pillows, bumpers, or toys. The ABCs of safe sleep are Alone, on their Back, in a Crib. Room-sharing without bed-sharing for at least the first 6 months reduces SIDS risk by up to 50 percent.
Co-sleeping to Crib Transition
Transitioning from co-sleeping to a crib is a common journey that many families navigate. Whether you are moving your baby for safety, sleep quality, or personal reasons, a gradual approach tends to work best. Most babies adjust within 1-3 weeks with patience and consistency, though some take a bit longer.
My Baby Only Sleeps When Being Held
It is completely normal and biologically expected for babies, especially newborns, to prefer sleeping while being held. Babies are born with a strong instinct to stay close to their caregiver for warmth, comfort, and safety. While this is not a problem to "fix," most families eventually need their baby to sleep independently, and gentle, gradual transitions can help when you are ready.
Baby Only Napping 30 Minutes
Short naps of 30-45 minutes are extremely common in babies under 6 months. Your baby is waking at the end of a single sleep cycle and has not yet learned to link cycles together during the day. This is developmentally normal and typically improves on its own between 5-7 months as the brain matures.
Baby Cries Every Time You Put Them Down to Sleep
Many babies cry when placed in the crib because they have learned to associate falling asleep with being held, rocked, nursed, or bounced. This is called a sleep association, and while it is not harmful, it means your baby needs that same condition to fall back asleep each time they wake during the night. Gradually teaching your baby to fall asleep in their sleep space - at whatever pace works for your family - is the foundation of independent sleep. This does not mean you are doing anything wrong; you are meeting a developmental need while gently building a new skill.
Baby Only Falls Asleep in the Car or While Moving
Many babies develop a strong preference for motion-based sleep because the rhythmic movement mimics the womb environment and activates the calming reflex. While using car rides or stroller walks occasionally is fine, relying on motion as the only way your baby will sleep can become unsustainable and creates a strong sleep association. Motion sleep is also lighter and less restorative than stationary sleep. The good news is that you can gradually transition your baby to sleeping in their crib by slowly reducing the motion component.