Lullaby Trust Safe Sleep Guidance, Explained: What It Says and How to Follow It

The Lullaby Trust is a UK charity that works to prevent sudden infant death syndrome (SIDS) and supports families whose babies have died suddenly and unexpectedly. It funds research into sudden infant death, runs the safer sleep campaigns you may have seen in maternity wards and health visitor clinics, and publishes the safer sleep advice that the NHS shares with new parents. When your midwife or health visitor talks to you about safe sleeping, they are drawing on the same evidence base.

That evidence base has a remarkable record. Since the "Back to Sleep" campaign launched in the early 1990s, SIDS rates in the UK have fallen by over 80%. Around 200 babies still die suddenly and unexpectedly in the UK each year, which is why the charity keeps campaigning and keeps updating its advice as new research comes in.

Two things to be clear about before we start. First, we are an independent baby and toddler sleep consultancy. We have no connection to the Lullaby Trust, and this page is not endorsed by them or by anyone else. Second, their website is the definitive version of this guidance. This page explains the advice in plain English and shows how it fits together, but for the exact current wording, or for a question about your own baby, go to the Lullaby Trust's safer sleep pages. They also run a free information line for specific questions about your setup.

The Lullaby Trust's advice comes down to a short list of rules that apply to every sleep your baby has, day and night, naps included:

• Sleep your baby on their back for every sleep.
• Give them their own clear sleep space for every sleep: a cot, Moses basket or bedside crib with nothing in it except your baby and their bedding.
• Use a firm, flat, waterproof mattress that fits the cot snugly.
• Keep the room at 16 to 20 degrees Celsius and dress your baby for the room temperature.
• Keep your baby in the same room as you for the first six months, for every sleep, day and night.
• Keep everywhere your baby spends time smoke-free, in pregnancy and after.
• Never sleep with your baby on a sofa or armchair.

Each of these is unpacked below. If you want a full room-by-room walkthrough, including products to avoid and what a safe setup looks like, our complete UK safe sleep guide covers all of it in more depth. This page focuses on what the Lullaby Trust itself says and where to find their version of each rule.

The Lullaby Trust advises placing your baby on their back for every sleep: every night, every nap, every time. Back sleeping is the single most effective thing a parent can do to reduce the risk of SIDS, and it is the change credited with the dramatic fall in deaths since the early 1990s.

Side sleeping is unsafe for young babies, because a baby placed on their side can roll onto their front. Once your baby can roll independently in both directions, usually around 4 to 6 months, you do not need to keep repositioning them if they roll during sleep. You still place them on their back to start every sleep.

Rolling has one more safety consequence. If you swaddle your baby, the swaddle must stop at the first signs of rolling, because a swaddled baby who ends up on their front cannot use their arms to push up or reposition. Our when to stop swaddling guide covers the signs to watch and how to make the change.

If your baby has reflux, back sleeping can feel counterintuitive. The evidence still supports it: healthy babies on their backs have a natural reflex to turn their head and swallow or cough up fluid. If you are worried about your baby's reflux or breathing, speak to your GP or health visitor.

The Lullaby Trust advises that the safest cot is a clear cot: nothing in it except your baby and their bedding. That means no pillows, no duvets, no cot bumpers (including mesh ones), no sleep positioners or wedges, no pods or nests, and no toys. Their guidance permits one small, breathable comforter from six months.

The sleep surface itself should be a firm, flat, waterproof mattress that fits the cot snugly, with no gaps around the edges where a baby could become trapped. The charity recommends a new mattress for each baby where possible. If you reuse one, check that it is still firm and flat, in good condition, and thoroughly cleaned.

If you use blankets rather than a sleeping bag, the Lullaby Trust advises the "feet to foot" position: your baby's feet touching the bottom of the cot, with lightweight blankets tucked in firmly below shoulder level so they cannot wriggle underneath. A baby sleeping bag at the right TOG for the room removes that worry, which is why the charity recommends sleeping bags as a safer alternative to loose bedding.

One thing their product guidance repeats often, and we will repeat here: being sold in a well-known shop does not make a product safe for sleep. Pods, nests, weighted sleeping bags and padded bumpers are all widely sold and none of them meet the guidance. Their product information pages are the place to check anything you have been given or are thinking of buying.

The Lullaby Trust advises a room temperature of 16 to 20 degrees Celsius for sleeping babies. Overheating is a known risk factor for SIDS, so it is safer for a baby to be slightly cool than too warm. A basic room thermometer costs a few pounds and takes the guesswork out of it.

To check your baby's temperature, feel the back of their neck or their tummy. Hands and feet are normally cooler, so they will mislead you. Signs of overheating include sweating, a hot or flushed chest and damp hair. Keep the cot away from radiators, heaters and direct sunlight, and never put a hat on your baby for sleep indoors, because babies lose excess heat through their heads.

What your baby wears matters as much as the room itself. Sleeping bags are rated by TOG, a measure of warmth: roughly, 0.5 TOG for hot summer rooms, 1.0 TOG for moderate temperatures, 2.5 TOG for cooler rooms. Our baby sleeping bag TOG guide matches TOG ratings and clothing layers to each temperature band, and our baby room temperature guide covers keeping the room itself in range through heatwaves and cold snaps. The Lullaby Trust publishes its own what should my baby wear in bed guide, which is the version to treat as current.

The Lullaby Trust is clear that the safest place for your baby to sleep is their own clear, firm, flat sleep space in the same room as you. It is equally clear-eyed about real life: surveys the charity has run found that nine in ten parents co-sleep with their baby at some point, planned or otherwise. So the guidance does two jobs. It names the situations where bed-sharing must never happen, and it explains how to reduce risk when it does.

The never list. The Lullaby Trust advises that you must not bed-share at all if you or anyone in the bed has drunk any alcohol, has taken drugs or medication that causes drowsiness, or smokes (or smoked during pregnancy), or if your baby was born premature (before 37 weeks) or weighed under 2.5kg at birth. These are not judgement calls. Even one drink impairs your ability to sense your baby's position in the bed.

Sofas and armchairs sit outside the list entirely, because they are never safe. The risk of SIDS is 50 times higher when a baby sleeps on a sofa or armchair with an adult. If you feel yourself getting drowsy during a night feed, move to a bed. If there is any chance you might fall asleep feeding at night, prepare the bed first: pillows and duvets away from where your baby will be, no gaps between mattress and wall.

If you do bed-share, the Lullaby Trust advises a firm, flat mattress, baby on their back, adult bedding kept well away from them, no other children or pets in the bed, and never leaving a baby alone on an adult bed. Our co-sleeping safety guide goes through the evidence behind each of these, including why the guidance treats breastfeeding mothers' bed-sharing differently from other arrangements.

Alongside the rules about the sleep space, the Lullaby Trust's guidance covers factors associated with lower risk.

Dummies. Research suggests that using a dummy at the start of every sleep reduces the risk of SIDS. The guidance adds three practical points: if you are breastfeeding, wait until feeding is well established, around four weeks, before introducing one; if your baby refuses it, do not force it; and if it falls out during sleep, you do not need to put it back. Our dummies and sleep guide covers introducing one, and later ditching it, in detail.

Breastfeeding. Research shows that breastfeeding for at least two months halves the risk of SIDS, and any amount of breastfeeding is protective, including partial breastfeeding alongside formula. The guidance presents this as a protective factor, and families who cannot breastfeed, or choose not to, reduce risk by following all the other safer sleep advice.

A smoke-free home. Smoking is one of the biggest modifiable risk factors for SIDS, in pregnancy and after birth. The Lullaby Trust advises keeping your home, your car and everywhere your baby spends time completely smoke-free, including vaping, and never bed-sharing if you or your partner smoke. Your GP or health visitor can help if you want support to quit.

Room-sharing. The charity advises that your baby sleeps in the same room as you for at least the first six months, for every sleep, day and night, including daytime naps. The evidence shows the risk of SIDS is lower when a baby sleeps in the same room as a parent or carer. Room-sharing means their own sleep space in your room, whether cot, Moses basket or bedside crib.

The Lullaby Trust's guidance asks for extra caution with babies born before 37 weeks or weighing under 2.5kg at birth. These babies have less mature arousal mechanisms, which makes the standard safer sleep rules matter even more, and it is why premature and low birth weight babies appear on the never-bed-share list. The charity advises that they always sleep in their own clear, separate sleep space.

Age works differently for premature babies too. The relevant age for sleep safety is corrected age, counted from your baby's due date. A baby born at 34 weeks who is now three months old has a corrected age of roughly seven weeks, which places them in the highest-risk window even though the calendar says otherwise.

If your baby was premature or small at birth, especially if they spent time in neonatal care, ask your midwife, neonatal team, health visitor or GP for safer sleep advice specific to your baby before making any decisions about sleep arrangements. They know your baby's history, and this is one area where general guidance should always give way to individual medical advice.

Safer sleep advice is not fixed. Babies used to be routinely put down on their fronts. That changed in the early 1990s when the evidence for back sleeping became overwhelming, and SIDS deaths fell by over 80% as a result. More recently the guidance has moved on products: pods, nests and weighted sleeping bags were all sold for years before the advice against them became explicit. The Lullaby Trust reviews its guidance as research develops, which means any explanation of it, including this one, has a shelf life.

So treat this page the way we intend it: a plain-English map of the guidance as we understand it at the time of writing. For anything that affects a decision about your baby, check the current wording at lullabytrust.org.uk. Their pages are updated by the charity itself, they run a free information line for questions about your specific setup, and your health visitor can review your baby's sleep environment with you in person.

And if you are ever worried about your baby's health, breathing or wellbeing, contact your GP, health visitor or 111. This page is sleep information, not medical advice.