Safe Sleep Guidelines for Babies: NHS Advice Explained

By Angelica Videla — Certified Baby and Toddler Sleep Consultant, London | Supporting families across the UK, Europe, US, and Australia

As a sleep consultant, I work with parents every day to improve their baby's sleep. But before we talk about wake windows, bedtime routines or sleep training, we always start with safe sleep. Because no sleep improvement is worth compromising your baby's safety.

This guide explains current NHS and Lullaby Trust safer sleep guidance in plain English. It covers everything UK parents need to know about reducing the risk of sudden infant death syndrome (SIDS) and creating a safe sleep environment for their baby.

Why Safe Sleep Matters

Sudden infant death syndrome (SIDS) — sometimes called cot death — is the sudden and unexpected death of a baby where no cause is found. In the UK, around 200 babies die suddenly and unexpectedly every year, with most cases occurring in the first 6 months of life.

We do not fully understand why SIDS happens. But decades of research have identified clear risk factors. Following NHS safer sleep guidance significantly reduces the risk. The drop in SIDS cases since the "Back to Sleep" campaign in the 1990s shows how effective these measures are.

Every recommendation in this guide is based on current evidence. None of it is about perfection or creating anxiety. It is about understanding the research and making informed choices that keep your baby as safe as possible while they sleep.

Safe Sleep Position: Always on the Back

The safest sleep position for babies is always on their back. This applies to every sleep — nighttime and daytime naps — from birth until your baby is at least one year old.

Babies who sleep on their back are significantly less likely to die from SIDS than babies who sleep on their front or side. The reason is not fully understood, but it may be related to airways remaining clearer when a baby is on their back.

What about when your baby can roll? Once your baby can roll independently from back to front and front to back (usually around 4-6 months), you do not need to reposition them if they roll onto their side or front during sleep. The increased risk period for SIDS has passed by this stage, and your baby has developed the neck and upper body strength to move their head if needed.

However, you should still always place your baby on their back to sleep, even once they can roll.

Safe Cot Setup

A safe cot environment is simple. Your baby needs:

• A firm, flat mattress that fits the cot properly with no gaps
• A fitted sheet — nothing else on the mattress
• No pillows, duvets, quilts, or cot bumpers
• No loose blankets (use a baby sleeping bag instead)
• No soft toys, comforters, or cot bumpers
• The cot should meet current British Safety Standards (BS EN 716)

Why a firm mattress? A soft mattress can mould to a baby's face and restrict breathing. The mattress should be firm enough that it does not indent significantly when your baby lies on it.

What about cot bumpers? Cot bumpers — fabric padding tied around the inside of the cot — were once common, but they are not recommended. They pose a suffocation risk if a baby's face presses against them, and older babies can use them as a step to climb out.

If your baby's cot is near a wall, make sure they cannot get trapped between the cot and the wall.

Feet-to-Foot Position

Place your baby so their feet are at the foot of the cot. This is called the "feet-to-foot" position.

The reason for this is simple: babies naturally wriggle upwards in their sleep. If their head starts at the top of the cot, they can end up with blankets or bedding over their face. Starting with their feet at the bottom of the cot means they have nowhere to wriggle to, which reduces the risk of anything covering their face.

If you are using a sleeping bag (which is recommended), the feet-to-foot position is less critical, but it is still good practice.

Room Sharing for the First 6 Months

The NHS and Lullaby Trust recommend that your baby sleeps in the same room as you for at least the first 6 months. This applies to both nighttime sleep and daytime naps.

Room sharing (but not bed sharing) significantly reduces the risk of SIDS. Having your baby close means you are more likely to notice if something is wrong, and your presence may help regulate their breathing and sleep patterns.

Your baby should sleep in their own cot or Moses basket in your room — not in your bed. The safest option is a standalone cot next to your bed, or a bedside crib that attaches securely to your bed frame.

After 6 months, the risk of SIDS reduces significantly, and many families choose to move their baby into their own room. This is a personal decision. Some babies sleep better in their own space, while others continue to settle well in their parents' room. There is no right or wrong answer after 6 months — it depends on what works for your family.

Bed Sharing and Co-Sleeping

The safest place for your baby to sleep is in a cot in the same room as you. Bed sharing significantly increases the risk of SIDS, and the NHS and Lullaby Trust advise against it, particularly in the first 3 months when the risk is highest.

Bed sharing becomes particularly dangerous if:

• You or your partner smoke (even if you do not smoke in the bedroom)
• You or your partner have drunk alcohol
• You or your partner have taken drugs or medication that make you drowsy
• You or your partner are extremely tired
• Your baby was premature or had a low birth weight

Never sleep with your baby on a sofa or armchair. This is extremely dangerous and significantly increases the risk of SIDS and accidental suffocation. If you are feeding your baby on the sofa or in an armchair and feel yourself getting drowsy, move your baby back to their cot immediately.

I understand that bed sharing sometimes happens unintentionally — particularly during night feeds when you are exhausted. If you think you might fall asleep while feeding, make sure your bed is as safe as possible: remove pillows, duvets, and any loose bedding, and ensure your baby cannot fall out or become trapped.

Room Temperature and Overheating

The ideal room temperature for a baby is between 16°C and 20°C (61-68°F). Babies can overheat easily, and overheating is a known risk factor for SIDS.

Use a room thermometer to monitor the temperature. In warmer weather, you may need to reduce the layers your baby wears or use a lighter sleeping bag. In colder weather, add layers or use a warmer sleeping bag rather than adding loose blankets.

How to check if your baby is too hot: Feel the back of your baby's neck or their tummy. If they feel hot or sweaty, remove a layer. Do not rely on checking your baby's hands or feet — these often feel cool even when the baby is warm enough.

Never use a hot water bottle, electric blanket, or heated pad in your baby's cot. Do not place the cot next to a radiator or in direct sunlight.

Sleeping Bags vs Blankets

Baby sleeping bags are safer than loose blankets. They keep your baby warm without the risk of bedding covering their face or your baby kicking off the covers and getting cold.

Choose a sleeping bag appropriate for the room temperature. Sleeping bags have a tog rating — the higher the tog, the warmer the bag. A 1.0 tog is suitable for warm weather (20-24°C), while a 2.5 tog works for cooler temperatures (16-20°C).

Make sure the sleeping bag fits properly. It should not be too loose around the neck or armholes, and your baby should not be able to slip down inside the bag. Check the manufacturer's size guidelines and weight recommendations.

If you do use blankets: Use lightweight cellular blankets rather than heavy bedding. Place your baby in the feet-to-foot position and tuck the blanket in securely so it only comes up to your baby's chest. Never let a blanket go higher than your baby's shoulders.

Safe Sleep When Travelling

When you are away from home, the same safe sleep rules apply. If you are staying somewhere overnight, take a travel cot that meets British Safety Standards. Check that the mattress is firm and fits properly with no gaps.

Do not let your baby sleep overnight in a car seat, bouncer, swing, or baby nest. These are not designed for unsupervised sleep and pose a suffocation risk. If your baby falls asleep in a car seat during a journey, that is fine for the duration of the journey, but move them to a flat, firm surface as soon as you reach your destination.

Car Seats and Sleep

Car seats are essential for car journeys, but they are not safe for extended sleep. Babies who sleep in car seats for long periods are at risk of their head flopping forward, which can restrict their airway.

If your baby falls asleep during a car journey, that is fine — car seats are designed for travel. But when you arrive at your destination, move your baby to a flat surface (a cot or Moses basket) as soon as possible.

Never leave a car seat on a raised surface where it could fall. Always place it on the floor if you are using it indoors temporarily.

Baby Sleep Products to Avoid

Several baby sleep products are marketed as helpful but pose serious safety risks:

• Baby nests, pods, and sleep positioners: These products claim to keep babies in a certain position or create a cosy environment, but they significantly increase the risk of suffocation. Do not use them for sleep.
• Cot bumpers: As mentioned earlier, these are not safe.
• Sleep wedges and anti-roll devices: These are not necessary and pose a suffocation risk.
• Duvets and pillows for babies under 12 months: These increase the risk of suffocation and overheating.
• Sheepskin, lambswool, or other soft bedding: These can cause overheating.

If a product is not recommended by the NHS or Lullaby Trust, do not assume it is safe just because it is sold in shops. Many unsafe products remain available despite evidence of risk.

Common Safe Sleep Myths

Myth: Babies will choke if they sleep on their back.
Fact: Babies are actually at lower risk of choking when sleeping on their back. Their anatomy means that anything they bring up will naturally move away from the airway when they are on their back.

Myth: My baby prefers sleeping on their tummy, so it must be safe.
Fact: Many babies do settle more easily on their tummy, but this does not make it safe. The risk of SIDS is significantly higher for babies who sleep on their front.

Myth: A warm room helps babies sleep better.
Fact: Overheating increases the risk of SIDS. A cooler room (16-20°C) is safer, and babies sleep better when they are not too hot.

Myth: Monitors prevent SIDS.
Fact: There is no evidence that baby monitors reduce the risk of SIDS. While monitors can provide reassurance, they are not a substitute for following safe sleep guidance.

Official NHS and Lullaby Trust Guidance

This article is based on current NHS and Lullaby Trust safer sleep guidance. For the most up-to-date official advice, visit:

• NHS: Reduce the risk of sudden infant death syndrome (SIDS)
• The Lullaby Trust: Safer Sleep for Babies

If you have specific questions or concerns about your baby's sleep safety, speak to your health visitor, GP, or a certified sleep consultant who follows evidence-based safer sleep guidance.

Frequently Asked Questions