Can Babies Sleep On Their Stomach Safely?

Back to Baby Sleep
Essentials
Every safe sleep guideline is clear on this one: always place your baby on their back to sleep. But what happens when your baby starts rolling onto their tummy at night? And when is it actually safe for them to sleep in that position? Here's what you need to know, backed by the latest guidance from the Lullaby Trust.
Genevieve Titov, Sleep Angel
6 min read |
04 November, 2023

Is it safe for babies to sleep on their stomach?

In short, no. Until your baby can roll both ways on their own, they should always be placed on their back for every sleep, including naps. Stomach sleeping significantly increases the risk of SIDS (Sudden Infant Death Syndrome), particularly in babies under 6 months.

The reason comes down to airway safety. Young babies don't yet have the neck and upper body strength to lift or turn their head if their breathing becomes restricted. Back sleeping keeps their airway clear and is the single most effective thing you can do to reduce the risk of SIDS.

At what age can a baby sleep on their tummy?

Most babies begin rolling between 4 and 6 months of age. Once your baby can confidently roll both ways (back to tummy and tummy to back), they've developed enough strength to reposition themselves during sleep. At that point, if they roll onto their stomach on their own, it's generally considered safe to leave them in that position.

However, the Lullaby Trust recommends continuing to place your baby on their back at the start of every sleep until they're 12 months old, even if they're rolling. The idea is that you always start them in the safest position, and if they choose to move from there, that's their call.

Dreamer Tip:

When your baby starts showing signs of rolling, it's time to stop swaddling. To protect your sleep and routine, try a specially designed transition swaddle, for a gentler graduation to arms-out sleep.

What is the safest position for a baby to sleep?

On their back, on a firm, flat surface, with nothing else in the cot. That's the gold standard for safe sleep.

Back sleeping doesn't just lower the risk of SIDS. Research also suggests that back sleepers may have a reduced risk of ear infections, nasal congestion, and fevers compared to babies who sleep on their stomachs.

For a full rundown of safe sleep best practices, our safe sleep guidelines article covers everything from room sharing to sleepwear. The Lullaby Trust is also an excellent resource for UK-specific safer sleep guidance.

What to do when your baby rolls onto their stomach during sleep

This is the moment that sends many parents into a quiet panic. You place your baby on their back, tiptoe out of the room, check the monitor 10 minutes later, and they're face down. Here's what the guidelines say:

  1. If your baby can roll both ways confidently, you don't need to go back in and flip them over. They have the strength and motor control to move their head and reposition if they need to. Make sure their sleep space is clear of blankets, pillows, and soft toys so there's nothing that could obstruct their breathing.
  2. If your baby can only roll one way (back to tummy, but not tummy to back), it's worth gently rolling them back. They haven't yet built the full strength needed to reposition themselves safely. This stage is usually short-lived as the reverse roll typically follows within a few weeks.

Either way, always start them on their back. Even once rolling is well established, placing your baby on their back at the start of every sleep is still the recommendation until 12 months.

This is also the point where swaddling needs to stop. A swaddled baby who rolls onto their stomach doesn't have free arms to push up or adjust their position, which is dangerous. If your baby is showing any signs of rolling, it's time to transition to a sleeping bag or transition suit that leaves their arms free.

Not sure if your baby is getting ready to roll? Here are the signs to look for:

If you're seeing any of these signs, it's time to move out of a swaddle and into a transition bag that gives your baby's arms freedom to move and reposition during sleep. Our Swaddle Up Transition Bag makes this easy by letting you unzip one arm at a time, for a gentler transition to arms free sleep.

Shop Transition Bags

  • Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Olive Twigs Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Olive Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Olive Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Olive Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Olive Twigs
    Size: Size guide
    1.5 TOG | 18-22˚C
    Swaddle Up™ 2-in-1 Transition Bag
    Olive Twigs •Cotton Fleece
    £34.99
    Quick add
    Quick add
  • New
    Swaddle Up™ 2-in-1 Transition Bag 1.0 TOG Cotton Powder Blue Twinkle Swaddle Up™ 2-in-1 Transition Bag 1.0 TOG Cotton Powder Blue Twinkle
    Swaddle Up™ 2-in-1 Transition Bag 1.0 TOG Cotton Powder Blue Twinkle
    Swaddle Up™ 2-in-1 Transition Bag 1.0 TOG Cotton Powder Blue Twinkle
    Swaddle Up™ 2-in-1 Transition Bag 1.0 TOG Cotton Powder Blue Twinkle
    Size: Size guide
    1.0 TOG | 20-24˚C
    Swaddle Up™ 2-in-1 Transition Bag
    Powder Blue Twinkle •Cotton
    £32.99
    New
    Quick add
    Quick add
  • Save £7.98
    Transitioning Bundle | 1.0 | 1.5 TOG | Blue Twinkle | Olive Twigs Transitioning Bundle | 1.0 | 1.5 TOG | Blue Twinkle | Olive Twigs
    Transitioning Bundle | 1.0 | 1.5 TOG | Blue Twinkle | Olive Twigs
    Transitioning Bundle | 1.0 | 1.5 TOG | Blue Twinkle | Olive Twigs
    Transitioning Bundle | 1.0 | 1.5 TOG | Blue Twinkle | Olive Twigs
    1.0 TOG | 20-24˚C 1.5 TOG | 18-22˚C
    Transitioning Bundle
    Powder Blue & Olive •Cotton & Cotton Fleece
    RRP £67.98
    £60.00
    View product details
    Size: Size guide
    1.0 TOG | 20-24˚C 1.5 TOG | 18-22˚C
    Transitioning Bundle
    Powder Blue & Olive •Cotton & Cotton Fleece
    RRP £67.98
    £60.00
    Save £7.98
    View Bundle
    View Bundle
  • Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Oatmeal Twigs Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Oatmeal Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Oatmeal Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Oatmeal Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Oatmeal Twigs
    Size: Size guide
    1.5 TOG | 18-22˚C
    Swaddle Up™ 2-in-1 Transition Bag
    Oatmeal Twigs •Cotton Fleece
    £34.99
    Quick add
    Quick add
  • New
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Fleece Blush Twigs Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Fleece Blush Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Fleece Blush Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Fleece Blush Twigs
    Swaddle Up™ 2-in-1 Transition Bag 1.5 TOG Cotton Fleece Blush Twigs
    Size: Size guide
    1.5 TOG | 18-22˚C
    Swaddle Up™ 2-in-1 Transition Bag
    Blush Twigs •Cotton Fleece
    £34.99
    New
    Quick add
    Quick add
  • New
    Transition Bag™ & Suit Sleeves Cotton Grey Transition Bag™ & Suit Sleeves Cotton Grey
    Transition Bag™ & Suit Sleeves Cotton Grey
    Transition Bag™ & Suit Sleeves Cotton Grey
    Transition Bag™ & Suit Sleeves Cotton Grey
    Size: Size guide
    Transition Bag™ & Suit Sleeves
    Grey •Cotton
    £7.99
    New
    Quick add
    Quick add

The role of tummy time (while awake)

Tummy time isn't just a fun activity. It's actually building the strength your baby needs to eventually sleep safely in any position. When your baby spends time on their tummy while awake and supervised, they're developing the neck, shoulder, and arm muscles that allow them to lift and turn their head.

The NHS recommends starting tummy time from birth, building up gradually as your baby gets stronger. You don't need to do it all at once. Short bursts throughout the day work just as well.

Strong tummy time skills lead to confident rolling, which leads to a baby who can safely reposition themselves during sleep. It's all connected.

Understanding the risks: SIDS and SUDI

You'll see two terms used in safe sleep discussions, and it helps to know the difference:

SIDS (Sudden Infant Death Syndrome) is the term used when a healthy baby under 12 months dies unexpectedly during sleep and no cause can be determined even after investigation. Most SIDS-related incidents occur before 6 months of age.

SUDI (Sudden Unexpected Death in Infancy) is the broader category used in the UK that includes SIDS as well as deaths from accidental suffocation, strangulation, or other causes during sleep.

While researchers don't know the exact cause of SIDS, extensive studies have identified several factors that increase the risk:

  • Sleeping on the stomach or side
  • Overheating during sleep
  • Soft bedding, blankets, pillows, or toys in the cot
  • Sharing a bed with adults, other children, or pets
  • Exposure to cigarette smoke
  • Sleeping on unsuitable surfaces like sofas, armchairs, or cushions

The most important thing you can do is follow the ABCs of safe sleep: Alone (in their own sleep space), on their Back, in a clear Cot. The Lullaby Trust has comprehensive guidance on reducing the risk, and our safe sleep guidelines article goes into more detail on each of these.

Creating a safe sleep environment

Beyond sleep position, the space your baby sleeps in matters just as much. Here's a quick checklist:

  • Firm, flat mattress that fits snugly in the cot with no gaps
  • Nothing else in the cot during sleep (no blankets, pillows, bumpers, or soft toys)
  • Room sharing (but not bed sharing) for at least the first 6 months (the NHS recommends this as standard)
  • Comfortable room temperature (16-20°C) paired with the right TOG-rated sleepwear so your baby doesn't overheat
  • No smoking in the house or around the baby

For more on setting up the perfect sleep space, our nursery setup guide walks you through everything, and our guide to the best baby room temperature helps you get the climate right.

Dreamer Tip:

If you're worried about your baby's temperature at night, feel the back of their neck or tummy rather than their hands or feet. Hands and feet naturally run cooler and aren't always the best indicator of overall body temperature.

Key takeaways

Always start on the back.
Place your baby on their back for every sleep until 12 months. It's the single most effective way to reduce the risk of SIDS.
Rolling both ways?
Once your baby rolls confidently in both directions, you don't need to flip them back. Just keep the cot clear and be sure to no longer swaddle.
Stop swaddling when rolling starts.
Transition to a sleeping bag or transition suit that leaves arms free so your baby can reposition safely.
Tummy time builds safe sleep skills.
Awake tummy time strengthens the neck and arms your baby needs to reposition during sleep. Start early, do a little daily.
Remember the ABCs.
Alone, on their Back, in a clear Cot. These three principles are the foundation of safe sleep at every age.

Related Articles from our

Sleep School

  • Safe Sleep Guidelines for Babies

    Safe sleep can feel overwhelming when you're running on little of it. These newborn sleep guidelines break down the basics — so you can rest easier, too.

  • Can Newborns Sleep on their Side?

    Newborn sleep can be overwhelming. Wondering if your baby can sleep on their side or tummy ? Back sleeping on a firm, flat surface is safest — here's why.

Most popular blog posts

See all
Sarah's Story
Behind the Zzz's

Sarah's Story

Newborn Sleep Savers: 7 Simple Tips for the First Few Weeks
How to Survive Postpartum Sleep Deprivation (and Actually Feel Human Again)