Safe Sleeping Guidelines UK: Lullaby Trust and NHS Rules (2026)

Approximately 200 babies die suddenly and unexpectedly in the UK every year. The most recent data recorded 164 unexplained infant deaths in England and Wales in 2023, at a rate of 0.28 per 1,000 live births. The majority of these deaths are classified as sudden infant death syndrome (SIDS), also known as cot death.

87% of SIDS deaths occur in the first 6 months of life, with the highest risk at 1 to 2 months of age. These are not statistics to skim over. Every one represents a family whose world changed in the worst possible way.

The good news is that the evidence on reducing risk is strong, clear, and actionable. Since the "Back to Sleep" campaign launched in the early 1990s, SIDS rates in the UK have fallen by over 80%. The Lullaby Trust, the UK's leading charity for the prevention of sudden infant death, provides guidance that is updated regularly based on the latest research. The NHS and NHS Start4Life programme provide the same evidence-based safe sleeping guidelines.

This guide brings together every current UK safe sleeping guideline in one place. It covers the Lullaby Trust's six core rules, room temperature guidance, co-sleeping evidence, products to avoid, and what IS safe. Every recommendation is aligned with the Lullaby Trust and NHS as of 2026.

This is not about creating fear. It is about giving you clear, evidence-based information so you can feel confident that your baby's sleep environment is as safe as it can be. The safest sleep environment is, reassuringly, also the simplest one.

The Lullaby Trust safer sleep guidelines and the NHS safe sleeping guidelines can be summarised in six core rules. These are non-negotiable regardless of your baby's age, sleep situation, or what products you have been recommended.

1. Always Place Baby on Their Back to Sleep

Back to sleep, for every sleep, every nap, every time. This single action is one of the most effective ways to reduce SIDS risk. The "Back to Sleep" campaign is the reason SIDS rates dropped so dramatically in the 1990s, and back sleeping remains the most important safe sleep practice in the UK.

Side sleeping is not safe for young babies. Babies placed on their sides can easily roll onto their front. Once your baby can roll independently in both directions (usually around 4 to 6 months), you do not need to reposition them if they roll onto their front during sleep. But always place them on their back to start every sleep.

If your baby has reflux, you might worry that back sleeping is unsafe. The evidence does not support this concern. Healthy babies placed on their back have a natural reflex to turn their head and swallow or cough up fluid. Back sleeping is still the safest position, even for babies with reflux. If you are concerned about your baby's breathing or reflux symptoms, speak to your GP or health visitor. For more on reflux and sleep, see our illness and sleep guide.

2. Keep the Cot Clear

The safest cot has nothing in it except your baby and their bedding. That means:

• No pillows or duvets
• No cot bumpers (including "breathable" mesh ones)
• No toys or soft toys (a small breathable comforter is permitted from 6 months per Lullaby Trust guidance)
• No sleep positioners or wedges
• No pods or nests
• No loose blankets near the face

If using blankets rather than a sleeping bag, place your baby in the "feet to foot" position, with their feet at the bottom of the cot, and tuck blankets in firmly below shoulder level so they cannot wriggle underneath. A baby sleeping bag at the correct TOG rating for the room temperature is a safer alternative to loose blankets. See our guide to the best baby sleeping bags for recommendations.

3. Room Temperature 16 to 20 Degrees Celsius

The Lullaby Trust recommends 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.

Use a room thermometer. Do not guess. Check your baby's temperature by feeling the back of their neck or their tummy, not their hands and feet (which are normally cooler). Signs of overheating include sweating, a hot or flushed chest, damp hair, and rapid breathing.

Never place the cot next to a radiator, heater, or in direct sunlight. Remove hats indoors, as babies lose excess heat through their heads. See the room temperature and TOG section below for a detailed breakdown of what to dress your baby in at each temperature.

4. Use a Firm, Flat, Waterproof Mattress

Your baby's mattress should be firm and flat. Their head should sink no more than a few millimetres into the surface. The mattress must fit the cot snugly with no gaps around the edges where a baby could become trapped.

The Lullaby Trust recommends buying a new mattress for each baby where possible. If reusing a mattress, make sure it is still firm, flat, and in good condition, with no tears or sagging. It should have a waterproof cover that is thoroughly cleaned.

Second-hand cots are fine as long as they meet current British safety standards and the mattress is replaced or properly inspected. For full nursery setup guidance, see our nursery setup guide.

5. Room Share for the First 6 Months

The Lullaby Trust recommends that your baby sleeps in the same room as you for at least the first 6 months, for every sleep, day and night. This includes daytime naps. The evidence shows that the risk of SIDS is lower when baby sleeps in the same room as a parent or carer.

Room sharing does not mean bed sharing. Your baby should have their own clear sleep space, whether that is a cot, Moses basket, or bedside crib, placed in your room. After 6 months, you can consider moving baby to their own room if you feel ready. Continue to follow all other safer sleep guidelines. For guidance on the transition, see our moving baby to their own room guide.

6. Keep a Smoke-Free Environment

Smoking is one of the biggest modifiable risk factors for SIDS. If a mother smokes 1 to 9 cigarettes per day during pregnancy, SIDS risk is 4 times higher. Scientific evidence suggests that 30% of sudden infant deaths could be avoided if no mothers smoked during pregnancy. When combined with postnatal exposure, smoking could be linked to 60% of sudden infant deaths.

Keep your home, car, and everywhere baby spends time completely smoke-free. This includes vaping. If you or your partner smoke, never co-sleep with your baby. The Lullaby Trust provides support for parents who want to quit. Your GP or health visitor can also help.

Getting the room temperature right is one of the most practical things you can do for safer sleep. The Lullaby Trust recommends 16 to 20 degrees Celsius. Within that range, what your baby wears to bed matters just as much as the room temperature itself.

What Is a TOG Rating?

TOG stands for Thermal Overall Grade. It measures how warm a sleeping bag or blanket is. The higher the TOG, the warmer the product. Baby sleeping bags typically come in 0.5 TOG (lightweight, for summer), 1.0 TOG (standard, for moderate temperatures), 2.5 TOG (warm, for cooler rooms), and 3.5 TOG (extra warm, for cold rooms).

Room Temperature and Clothing Guide

This is a general guide based on Lullaby Trust recommendations. Every baby is different, so check the back of your baby's neck regularly to see if they feel too warm or too cool.

• Above 25 degrees: Nappy only, or nappy plus a 0.5 TOG sleeping bag. No vest.
• 23 to 25 degrees: Short-sleeved vest plus a 0.5 TOG sleeping bag.
• 21 to 23 degrees: Short-sleeved vest plus a 1.0 TOG sleeping bag.
• 18 to 20 degrees: Long-sleeved vest or babygrow plus a 1.0 to 2.5 TOG sleeping bag.
• 16 to 18 degrees: Long-sleeved vest or babygrow plus a 2.5 TOG sleeping bag.
• Below 16 degrees: Long-sleeved vest, babygrow, and a 2.5 to 3.5 TOG sleeping bag. Consider adding a layer underneath rather than adding blankets on top.

Tips for Managing Room Temperature

Summer heat: UK bedrooms can easily exceed 25 degrees in summer. Use a fan to circulate air (not pointed directly at baby), open windows, and strip back layers. A 0.5 TOG sleeping bag or just a vest and nappy may be enough. If the room is consistently above 27 degrees, the Lullaby Trust suggests keeping curtains or blinds closed during the day and placing a bowl of cool water in the room to bring the temperature down. For more summer sleep tips, see our summer light and baby sleep guide.

Winter cold: If your home is well insulated, most bedrooms stay within the 16 to 20 degree range. A 2.5 TOG sleeping bag with a long-sleeved babygrow underneath is usually sufficient. Do not use electric blankets, hot water bottles, or wheat bags in the cot. Never use a hat indoors for sleep.

Room thermometer: A basic digital room thermometer costs a few pounds and is essential. Place it near the cot, away from windows and radiators, for an accurate reading. Do not rely on how the room feels to you, as adults regulate temperature differently to babies.

If you are unsure what to dress your baby in, your health visitor can help. The Lullaby Trust also has a helpful what should my baby wear in bed guide on their website.

Co-sleeping is one of the most emotionally charged topics in baby sleep. Many families co-sleep, whether by choice or because they fall asleep during a night feed out of sheer exhaustion. This section is not about judgement. It is about evidence.

The safest place for a baby to sleep is their own clear, firm, flat sleep space in the same room as you. The Lullaby Trust and NHS are clear on this. Room sharing for the first 6 months, with baby in their own cot or Moses basket, carries the lowest risk.

When Co-Sleeping Must Be Avoided Entirely

The Lullaby Trust and NHS state that bed sharing must be avoided entirely if:

• You or anyone in the bed has consumed any alcohol
• You or anyone in the bed has taken drugs (recreational or prescription medication that causes drowsiness)
• You or anyone in the bed smokes or smoked during pregnancy
• Your baby was born premature (before 37 weeks)
• Your baby had a low birth weight (under 2.5kg)

These are not guidelines to interpret loosely. Even a small amount of alcohol impairs your ability to sense your baby's position in the bed. Even if you smoked during pregnancy but have since stopped, the risk remains elevated.

If You Do Co-Sleep: Reducing Risk

The Lullaby Trust acknowledges that many parents co-sleep and provides guidance on how to reduce risk. The UNICEF Baby Friendly Initiative also provides evidence-based co-sleeping guidance. If you co-sleep, the following reduce (but do not eliminate) risk:

• Use a firm, flat mattress. Not a waterbed, not a sofa, not an armchair.
• Keep pillows and duvets away from baby. Some parents use a separate sleeping bag for baby on top of the adult bed.
• Make sure baby cannot fall off the bed or become trapped between the mattress and the wall or headboard.
• Do not leave baby alone on an adult bed.
• Keep other children and pets out of the bed.
• Baby should sleep beside a breastfeeding mother (not between two adults, and not next to a partner who has been drinking).

If you are considering transitioning away from co-sleeping, our guide to transitioning out of co-sleeping covers gentle approaches that work for different ages.

The Sofa and Armchair Warning

This is the single most dangerous sleep scenario. The risk of SIDS is 50 times higher when a baby sleeps on a sofa or armchair with an adult. Babies can slip between the adult and the cushions into a position where they cannot breathe. This applies whether you intend to fall asleep or not.

If you feel drowsy during a night feed, move to a bed. Remove pillows and duvets from the bed first if possible. Falling asleep in a bed, even unintentionally, is significantly safer than falling asleep on a sofa. If you are breastfeeding at night and worried about falling asleep, prepare the bed as a safer co-sleeping environment before the feed, just in case.

Many popular baby sleep products do not meet Lullaby Trust safer sleep guidelines. Being sold in shops, even well-known high street shops, does not mean a product is safe for sleep. Being gifted by family does not mean it is safe for sleep. Here is what the evidence says.

Sleep Pods and Nests (Including DockATot and Similar Products)

Sleep pods have padded sides that create a suffocation and overheating risk. They do not provide a firm, flat surface. The Lullaby Trust has repeatedly warned against using them for sleep. DockATot's own website now states the product is "not intended for overnight sleep." Despite this, they are still widely sold, gifted, and used. If you have been using one, move to a clear cot or Moses basket from tonight.

Weighted Sleep Sacks and Weighted Blankets

The Lullaby Trust specifically advises against all weighted sleep products for babies. They can restrict chest expansion for breathing and cause overheating. It does not matter how they are marketed. Claims about "mimicking a parent's touch" or "helping baby sleep deeper" are not supported by evidence. Deeper sleep in infants is itself a risk factor, as the Lullaby Trust has warned. A standard, unweighted sleeping bag at the correct TOG is the safe alternative.

Cot Bumpers

Padded bumpers pose a suffocation and entrapment risk. Even "breathable" mesh bumpers can become detached and create a strangulation hazard. Minor bumps from cot bars are not dangerous. Suffocation is. The safest approach is to keep the cot completely clear.

Sleep Positioners and Wedges

These can cause a baby to roll into an unsafe position or press their face against the positioner. They are sometimes marketed for reflux, but there is no evidence they reduce reflux risk, and they introduce new dangers. A firm, flat, clear mattress is the safest sleep surface.

Amber Teething Necklaces and Bracelets

These are a strangulation and choking hazard. There is no scientific evidence that amber releases succinic acid through the skin or that it reduces teething pain. They have no place near a sleeping baby, and the Lullaby Trust advises against them. For safe teething support, speak to your health visitor or pharmacist.

Breathing and Movement Monitors (Owlet, Snuza, and Similar)

These have not been proven to prevent SIDS. The Lullaby Trust does not recommend them as a way to reduce risk. They can create false reassurance ("the monitor is on, so other safe sleep practices are less important"), which is dangerous. They can also cause significant anxiety through false alarms. No monitor is a substitute for following safer sleep guidelines. If you are concerned about your baby's breathing, speak to your GP or health visitor. For more on this topic, see our baby sleep monitors guide.

After reading what to avoid, it helps to know exactly what a safe sleep environment looks like. The good news is that the safest setup is also the simplest and most affordable.

Safe Sleep Surfaces

• Cot or cotbed that meets British Standard BS EN 716. Check for a label or sticker confirming this.
• Moses basket that meets British Standard BS EN 1466. Suitable for the first few months.
• Bedside crib (co-sleeper crib) that meets BS EN 1130. These attach to the side of the adult bed, giving baby their own firm, flat sleep space while keeping them close.
• Travel cot that meets BS EN 716. Use only the mattress that came with it, as a different mattress may not fit properly.

Safe Bedding

Baby sleeping bags are recommended by the Lullaby Trust as a safer alternative to loose blankets. They prevent baby from wriggling under covers or kicking them off and getting cold. Choose a sleeping bag that fits your baby's weight (not age, as sizes vary between brands), has no hood, and is the correct TOG for your room temperature. See our best baby sleeping bags UK guide for recommendations.

If using blankets, use lightweight cotton or muslin blankets. Place baby in the feet-to-foot position (feet touching the bottom of the cot) and tuck blankets in firmly on both sides, below shoulder level. Do not use duvets, quilts, or pillows for babies under 12 months.

Safe Sleep Position

Always on their back, for every sleep. Once your baby can roll both ways independently, you do not need to keep turning them back. But always start them on their back.

Safe Sleep Environment

• Room temperature 16 to 20 degrees Celsius (use a thermometer)
• Same room as you for the first 6 months, for every sleep
• Away from radiators, heaters, and direct sunlight
• No hats indoors
• Smoke-free home

White noise machines are not mentioned in Lullaby Trust guidelines as either safe or unsafe. They are widely used and there is no evidence they increase risk. Keep the volume below 50 decibels (roughly the level of a quiet conversation) and place the machine away from the cot, not next to baby's head. For more on white noise, see our white noise and baby sleep guide.

Dummies are protective. Research suggests that using a dummy at the start of every sleep reduces SIDS risk. If breastfeeding, wait until feeding is well established (around 4 weeks) before introducing one. If your baby refuses it, do not force it. If it falls out during sleep, you do not need to replace it. For more on dummies, see our dummies and sleep guide.

Other Protective Factors

Breastfeeding: Research shows that breastfeeding for at least 2 months halves the risk of SIDS, with longer breastfeeding providing greater protection. Any amount of breastfeeding is protective, even partial breastfeeding alongside formula. This is a protective factor, not a requirement. Parents who cannot or choose not to breastfeed can reduce risk by following all other safer sleep guidance. For more on feeding and sleep, see our breastfeeding, formula, and sleep guide.

Vaccinations: There is no evidence that vaccinations increase SIDS risk. Some studies suggest they may have a protective effect. Keep your baby up to date with the NHS vaccination schedule.

Unsafe sleep for babies is any arrangement that increases the risk of SIDS, suffocation, or overheating. Both the Lullaby Trust and the NHS are clear on what counts as unsafe. If you recognise anything on this list in your current setup, do not panic. Just make the change from tonight.

• Stomach or side sleeping under 12 months. Placing a baby on their front or side to sleep before they can roll independently in both directions is one of the most significant risk factors for SIDS.
• Sleeping on a sofa or armchair with an adult. This is the highest-risk scenario. 50 times higher risk of SIDS. Babies can become trapped between the adult and the cushions.
• Co-sleeping after alcohol, drugs, or smoking. Even a small amount of alcohol or one cigarette during pregnancy elevates the risk significantly.
• Loose bedding, pillows, duvets, and toys in the cot. Anything that could cover a baby's face or cause overheating is unsafe.
• Cot bumpers. Padded or mesh. Both carry risk.
• Sleep pods and nests. Not a firm, flat surface. Suffocation and overheating risk.
• Weighted sleep sacks and blankets. Restrict breathing and cause overheating.
• Overheating. Room above 20 degrees, too many layers, hats indoors, cot near a radiator.
• Sleeping in a car seat, swing, or bouncer for prolonged periods. These are not designed for unsupervised sleep. The angle can cause a baby's head to fall forward, restricting their airway.
• Sleeping in a different room from a parent in the first 6 months. Room sharing is protective.
• Using a mattress that is too soft, sagging, or does not fit the cot. Gaps between the mattress and cot sides are an entrapment risk.
• Amber teething necklaces. Strangulation and choking risk, with no proven benefit.

If you are unsure whether your baby's sleep environment is safe, your health visitor can review it with you. The Lullaby Trust also has a free information line where you can ask specific questions about your setup. If you are worried about your baby's health at any point, contact your GP, health visitor, or call 111.

It is completely normal to worry about your baby's safety during sleep. Many parents lie awake watching their baby breathe, or check on them multiple times per night. That protective instinct is natural and understandable.

The goal of this guide is not to add to that anxiety. It is to reduce it. When you know the evidence and follow the guidelines, you can feel confident that you have done everything within your power to keep your baby safe.

If you have been using a product that does not meet the guidelines, a pod, a bumper, a weighted sack, please do not feel shame. Many of these products are popular, widely gifted, and marketed convincingly. Shops sell them. Friends recommend them. Social media promotes them. Now that you know, you can make changes from tonight. That is what matters.

Night waking is normal and potentially protective. A baby who rouses easily is a safer baby. When we talk about improving sleep, we mean supporting comfortable, age-appropriate sleep in a safe environment. Not encouraging babies to sleep deeper or longer than their developmental stage allows. If you are struggling with frequent waking, our baby sleeping through the night guide covers what is normal at each age.

If anxiety about your baby's safety is affecting your daily life, your sleep, or your ability to function, please speak to your GP or health visitor. Postnatal anxiety is common and treatable, and asking for help is a sign of strength, not weakness. You can also contact the PANDAS Foundation for support with perinatal mental health.

The Lullaby Trust provides a free safer sleep information line if you have specific questions about your setup. Your health visitor can also review your baby's sleep environment and offer personalised guidance.

If you are ever worried about your baby's health, trust your instincts and speak to your GP or health visitor. This guide is sleep support, not medical advice. You know your baby best.

• Unsafe Sleep for Babies: What to Avoid and Why
• Co-Sleeping Safety
• Baby Sleep Temperature Guide
• Best Baby Sleeping Bags UK
• Nursery Setup Guide