Co-sleeping: risks, benefits and safer alternatives

Newborn · Sleep · Reviewed 18 June 2026 · All articles

Co-sleeping is one of the most debated topics in infant care. It is widely practised across many cultures, yet major health organisations consistently advise caution or avoidance. Understanding what the evidence actually shows, and what the safer alternatives look like, can help you make an informed decision for your family.

The term co-sleeping covers a broad range of arrangements, from bed-sharing (the baby on the same adult mattress) to room-sharing (the baby in their own cot in the same room). These distinctions matter enormously for safety. Health guidance tends to recommend one and caution strongly against the other.

What the evidence shows on risk

The American Academy of Pediatrics (AAP), the NHS, and the World Health Organization (WHO) all cite a consistent body of evidence linking bed-sharing, particularly on a soft adult mattress with loose bedding, to an increased risk of sudden infant death syndrome (SIDS) and sleep-related infant death from accidental suffocation or overlay.

The AAP's most recent safe sleep guidelines, updated in 2022, state clearly that bed-sharing is not recommended under any circumstances, even on a firm surface without soft bedding. The risks are considered highest in the first six months of life and for babies born prematurely or with a low birth weight.

Research cited by the Lullaby Trust in the UK found that around half of all sudden infant deaths occur in an adult bed or other sleep surface not designed for infant sleep. This figure sits at the core of why health bodies maintain a strong, consistent position against bed-sharing.

Certain additional factors significantly raise the risk further. The AAP identifies these as: a parent or partner who smokes (even if they do not smoke in bed), a parent who has consumed alcohol or sedating medication in the preceding hours, extreme parental fatigue, a soft or water mattress, loose pillows or duvets, and the baby having been born prematurely or at a low birth weight. When any of these apply, the danger is considered markedly higher than the baseline bed-sharing risk.

What proponents of co-sleeping cite

Despite official guidance, many families continue to co-sleep and report positive experiences. Some researchers and advocates have proposed potential benefits, including easier breastfeeding at night, fewer disruptions to parental sleep, better infant sleep continuity, and greater ease of responding to a baby's needs at night. Some anthropologists point out that co-sleeping has been the norm for most of human history in most societies.

Some studies have suggested that breastfeeding mothers who bed-share may be more attuned to their baby's breathing and position during sleep. However, neither the NHS nor the AAP considers this evidence strong enough to change the overall risk assessment, and both organisations note that the well-documented dangers apply regardless of feeding method or level of parental awareness.

The NHS acknowledges that co-sleeping can be fulfilling for families and does not dismiss the practice with disregard. Instead, the guidance focuses on ensuring that if a parent does share a bed with their baby, it is done in a way that reduces risk as far as possible, while still being clear that a separate sleep surface in the same room remains the safest option.

Safer alternatives and arrangements

Room-sharing without bed-sharing is consistently recommended by both the AAP and the NHS. The AAP advises that babies should sleep in the same room as a parent, on a separate sleep surface designed for infants, for at least the first six months and ideally for the first year. Room-sharing without bed-sharing has been associated with a lower risk of SIDS compared with the baby sleeping in a separate room.

A firm, flat cot or crib with no soft bedding, bumpers, pillows, or toys is the recommended sleep surface. The mattress should be firm and flat, and the fitted sheet the only covering near the baby. Sleeping bags designed for babies are a safer alternative to loose blankets and are widely recommended by the Lullaby Trust and the NHS.

Bedside bassinets and co-sleeper cribs have become increasingly popular. These attach securely to the side of the adult bed and allow the baby to sleep at the same height as the parent while maintaining a separate surface. The baby can be easily reached for night feeds without being brought into the adult bed. Health visitors in the UK and paediatricians in other countries generally consider these a sensible middle ground, offering closeness without the risks associated with sharing an adult mattress and bedding.

For parents who feed lying down and are concerned about falling asleep during night feeds, the NHS offers specific guidance. If there is a risk of dozing off, the NHS recommends being in your bed rather than on a sofa or armchair, as falling asleep on a soft or upholstered surface with a baby is considerably more dangerous than dozing on a firm mattress. Removing duvets and pillows from the area and then moving the baby to their own surface as soon as you wake is the recommended approach.

For families who choose to bed-share despite the guidance, health organisations offer harm-reduction information rather than abandoning the conversation. The NHS and the Lullaby Trust both publish advice on making bed-sharing as safe as it can be, while still being explicit that a separate sleep surface remains safer.

The key harm-reduction points include: using a firm, flat mattress rather than a soft one; removing all pillows, duvets, and loose bedding from around the baby; keeping the baby away from the edges of the bed and from the gap between the mattress and wall; never placing the baby between two adults; ensuring neither parent has smoked, consumed alcohol, or taken medication that causes drowsiness; and being especially cautious if the baby is premature or has a low birth weight.

Never share a sofa, armchair, or recliner with a sleeping baby. The Lullaby Trust and the NHS are unambiguous on this point: these surfaces carry the highest risk of all and are responsible for a disproportionate number of sudden infant deaths.

It is also worth noting that advice evolves as research develops. Speaking with your health visitor, midwife, or GP about your specific situation and preferences is always worthwhile. They can help you think through your individual risk factors and identify the arrangement that best balances your needs with your baby's safety.

Frequently asked questions

Is co-sleeping ever safe?

Health bodies including the NHS, AAP and WHO advise against bed-sharing because of the risk of sudden infant death syndrome (SIDS) and accidental suffocation. However, if a parent falls asleep while feeding, having the baby on a firm, flat, clutter-free surface is safer than on a sofa or armchair. The safest sleep environment for any baby is a separate sleep surface in the same room as a caregiver for the first six months.

What makes bed-sharing more dangerous?

The AAP identifies several factors that significantly raise risk: a parent or partner who smokes (even if they do not smoke in bed), a parent who has consumed alcohol or sedating medication, extreme parental fatigue, a soft mattress, loose bedding, and a baby who was born prematurely or with a low birth weight. When any of these factors are present, the risk of SIDS or sleep-related death is considerably higher.

What is a bedside bassinet and is it safer?

A bedside bassinet (sometimes called a co-sleeper or bedside crib) attaches to the adult bed and allows a parent to reach and feed the baby without the baby sharing the adult sleep surface. The NHS and other health bodies consider this a safer alternative to bed-sharing, because the baby has their own firm, flat sleeping space while remaining close to the parent.

Does breastfeeding change the co-sleeping risk?

Some researchers have proposed that breastfeeding mothers may be more responsive to their baby during sleep. However, the NHS and AAP both note that the evidence is insufficient to recommend bed-sharing even for breastfeeding mothers, and that the well-documented risks apply regardless of feeding method. If you wish to feed lying down, returning the baby to their own sleep surface after the feed is the recommended approach.

What should I do if I am likely to fall asleep while feeding at night?

The NHS recommends that if there is a chance you will fall asleep while feeding, you should do so in your bed rather than on a sofa or armchair, as the latter carry a much higher risk of sudden infant death. Remove pillows and duvets from the area, ensure the mattress is firm and flat, and move the baby to their own safe sleep surface as soon as you wake. Planning ahead and having a firm, flat space prepared reduces the risk if you do doze off unintentionally.

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