Some newborns love being swaddled. They go in a furious, flailing starfish and come out a calm little parcel. Others object on principle, at volume, every time. Both are normal, and you don't need to swaddle at all if your baby settles without it.
If you do, it's worth doing properly, because the rules are short and they matter. This is the plain-English version. For the full guidance, the Lullaby Trust is the place to go, and your health visitor is there to ask.
Why it helps some babies
Newborns have a startle reflex. A sudden noise, or the feeling of being put down, can make their arms fling out, and that can wake them. A swaddle keeps the arms in close, so a twitch stays a twitch. Plenty of parents find it helps in the early weeks. It isn't a sleep cure, and it won't make a hungry baby less hungry.
The rules, with no exceptions
- Always on their back. Every sleep, day and night. A swaddled baby is never put down on their front or side.
- Never over the head or face. The swaddle stays below the shoulders. Nothing near the face, nothing over the head.
- Hips free to bend. Snug around the arms and chest is fine. Around the hips and legs it should be loose, so the legs can bend up and out at the hips, frog-style. Never wrap the legs straight and tight together.
- A light layer, and don't let them overheat. A thin cotton or muslin wrap, or a lightweight swaddle made for the job, not a blanket. A swaddled baby can't kick off a layer if they get hot, so think about what they're wearing underneath. The Lullaby Trust suggests a room temperature of 16–20°C, and no hats for sleeping indoors.
- Stop as soon as they show signs of trying to roll. More on this below, because it's the one people miss.
To check whether your baby is too warm, feel their chest or the back of their neck. Hands and feet are usually cooler and don't tell you much. If they're sweaty or hot to the touch, take a layer off.
How to do it
A traditional wrap takes practice, a flat surface and ideally a baby who isn't actively fighting you. Your midwife or health visitor can show you how. A zip swaddle takes most of the folding out of it:
- Lay it open on a flat surface.
- Place your baby in it on their back, shoulders below the top edge.
- Settle the arms in the way the swaddle's instructions show. Every design is a little different.
- Zip it closed: snug through the chest, roomy at the hips.
- Check: face clear, neck clear, legs able to bend. Then down on their back, in a clear, flat cot.
The joy of a two-way zip arrives at 3am. Unzip from the bottom to change a nappy and the arms stay wrapped. You don't unwrap the whole baby, so you don't wake the whole baby. Usually.
When to stop
Stop swaddling as soon as your baby shows any signs of trying to roll. Not when they've mastered it. When they start trying. That might look like rocking onto one shoulder, twisting their hips over, or getting partway onto their side.
The reason is simple. A baby who ends up on their front needs their arms free to push up and move their head. A swaddled baby can't do that. So from that point the swaddle comes off for every sleep, naps included, and not gradually.
Babies get there at different ages, which is why the rule is about what you see, not a date on the calendar. If you're not sure whether what you're seeing counts, treat it as a yes, and mention it to your health visitor.
Stopping before you have to
If you'd like to move on from the swaddle before there's any sign of rolling, some parents try one arm out for a few nights, then both. That's a gentle option when you have time. Once you see signs of rolling, you don't have time: both arms out, straight away.
What comes next: the sleep bag
Most families go straight from swaddle to sleep bag. Arms out, legs free to kick, and no blanket to lose by midnight. Choose one that's the right size for your baby's weight, fitted around the neck and armholes so they can't slip down inside, and without a hood. Check the tog against your room temperature using the guide that comes with it, and you don't need a blanket on top.
Expect a few unsettled nights during the switch. Their arms are suddenly very interesting. They will find their own face. It passes.
On their back. Clear, flat cot. Every sleep.
If you're wondering why we won't sell cot bumpers, sleep positioners, wedges or weighted sleep bags, the reasons are all on our standards page.
This article is general information, not medical advice. For anything about your baby's health, development or feeding, talk to your midwife, health visitor or GP, or call NHS 111.
