Sudden Infant Death Syndrome (SIDS) and sleep-related infant deaths are among every new parent's deepest fears. While the causes of SIDS are not fully understood, the risk factors are well-established across decades of research in multiple countries, and following safe sleep guidance significantly reduces risk. This guide covers the evidence-based practices that every parent should know.
The single most important safe sleep practice is back sleeping. Always place your baby on their back to sleep - this applies to every sleep, including naps, and regardless of whether your baby seems to prefer a different position. Front and side sleeping significantly increases SIDS risk. Once a baby can confidently roll from back to front and back again independently (usually around 5-6 months), you do not need to reposition them during sleep, but always start them on their back.
The sleep surface matters as much as position. Babies should sleep on a firm, flat mattress with a tightly fitted sheet, in a cot, Moses basket, or safety-certi…
The sleep surface matters as much as position. Babies should sleep on a firm, flat mattress with a tightly fitted sheet, in a cot, Moses basket, or safety-certified bedside sleeper. Soft bedding - duvets, pillows, bumper pads, positioning wedges, loose blankets, or stuffed animals - in the sleep space is dangerous and should be removed entirely. A well-fitted sleeping bag (sleep sack) is the recommended alternative to blankets; choose the correct tog rating for the room temperature.
Room-sharing - but not bed-sharing - for the first 6 months reduces SIDS risk by up to 50% in multiple independent studies. Having your baby sleep in the same room allows rapid response to distress. Bed-sharing carries increased risk, particularly when combined with parental smoking (including during pregnancy), alcohol consumption, extreme tiredness, or sleeping on a sofa or armchair - the latter being among the most dangerous infant sleep environments.
Temperature regulation is critical. Babies cannot control their own body temperature effectively. The recommended room temperature for infant sleep is 16-20C (61-68F). Check the back of your baby's neck or tummy - it should feel warm but not sweaty. Overheating is an independent risk factor for SIDS. Avoid indoor hats and heavy bundling, and reduce layers before sleep if the room is warm.
Dummies (pacifiers) offered at the start of every sleep - once breastfeeding is well-established, typically from around 4 weeks - have been shown in multiple studies to reduce SIDS risk by approximately 50%. The mechanism is not fully understood but may relate to maintaining a slightly lighter sleep state. You do not need to replace the dummy if it falls out once the baby is asleep.
Safe sleep practices protect your baby at every sleep, not just at night. Log your baby's sleep sessions in the tracker including the location - this data can be helpful at health visitor appointments and gives you a clear picture of where your baby is spending their sleep time. If you have questions about your specific situation, your midwife, health visitor, or paediatrician is always the right first contact.