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Swaddling: how to swaddle safely and when to stop

A snug wrap can calm a newborn. Done safely, it follows four rules: back to sleep, thin fabric, loose hips, and stopping the moment your baby starts to roll.

Updated October 13, 2026 · sources checked October 13, 2026

In short

Stop swaddling as soon as your baby shows any sign of trying to roll over. The AAP says rolling usually starts around 3 to 4 months, but some babies work on it from 2 months. Until then, a swaddled baby must always sleep on their back, wrapped in a thin fabric that leaves the hips free to bend, with no loose bedding and never weighted.

Why parents swaddle, and what it does not do

The AAP describes swaddling, done correctly, as a way to calm a newborn and help them sleep: a thin wrap can feel a little like the womb. It also notes the trade-off. Swaddling may reduce a baby's arousal, making them harder to wake, and it does not reduce the risk of SIDS. So it is optional, and it comes with strict rules.

The four non-negotiable rules

  1. Always on the back. Never put a swaddled baby down on their front or side (AAP, Lullaby Trust).
  2. Thin fabric, nothing on top. A thin muslin or thin cot sheet, not a thick blanket, and no extra bedding over a swaddled baby (Lullaby Trust).
  3. Hips free to move. Snug around the chest, loose around the hips and legs (AAP, Lullaby Trust).
  4. Never weighted. No weighted swaddles, blankets or objects such as rice bags inside the wrap (AAP).

How to swaddle, step by step

The method described by the AAP:

  1. Spread a thin blanket flat, with one corner folded down.
  2. Lay your baby face up, with their head above the folded corner.
  3. Straighten the left arm, wrap the left corner over the body and tuck it between the right arm and the right side of the body.
  4. Tuck the right arm down, fold the right corner over the body and under the left side.
  5. Fold or twist the bottom of the blanket loosely and tuck it under one side.
  6. Check: the hips can move and you can slide at least two or three fingers between the chest and the swaddle.

The Lullaby Trust adds: do not wrap above the shoulders, so loose fabric cannot cover the face, and wrap securely enough that it cannot come undone, since a loose wrap becomes loose bedding.

Hip-healthy swaddling

The AAP explains that straightening and tightly wrapping a baby's legs can lead to hip dislocation or hip dysplasia. It supports the "hip-healthy swaddling" promoted by the Pediatric Orthopaedic Society of North America: the legs should be able to bend up and out at the hips. The Lullaby Trust gives the same advice: keep the swaddle looser around the hips to allow natural movement.

DoAvoid
Room for the knees to bend up and outLegs pulled straight and pressed together
Snug at the chest, two or three fingers of spaceSo tight it restricts breathing
Wrap below the shouldersFabric up around the neck and face
Thin, breathable fabricThick blankets, extra layers on top

Avoid overheating

Swaddling can make a baby too hot (AAP). Signs to look for: sweating, damp hair, flushed cheeks, heat rash, rapid breathing. Dress your baby in the minimum under the swaddle, keep the head uncovered, and keep the room at 16 to 20°C (Lullaby Trust). Feel the chest or back of the neck: hands and feet are usually cooler, which is normal. For swaddle products, the Lullaby Trust gives no specific tog but suggests a lower tog to reduce the risk of overheating.

When not to swaddle at all

  • When you share a bed with your baby (NHS, Lullaby Trust).
  • When your baby has an infection or a fever (Lullaby Trust).
  • Once your baby shows any sign of rolling (AAP, Lullaby Trust).
  • If your baby has never been swaddled and is older: the AAP notes that babies swaddled for the first time at an older age react differently and may be harder to wake.

When to stop swaddling, and what comes next

Stop as soon as your baby shows signs of trying to roll over. The AAP says rolling usually happens around 3 to 4 months but can happen earlier, and some babies start working on it from 2 months. The same rule applies to swaddle sacks and wearable blankets that compress the arms, chest and body.

What comes next is simple: a sleep sack that does not swaddle and lets your baby move freely, which the AAP says can be used as long as you want. Our sleep sack and TOG guide explains how to choose one for your room temperature.

When to call for help

  • Talk to your pediatrician if you have any question about your baby's hips, or any doubt about your swaddling technique.
  • Call 911 (US) or 999 (UK) if your baby stops breathing, will not wake, is struggling for breath or turns blue or grey (NHS).

If your baby cries for long stretches despite swaddling, feeding and cuddles, read about crying and the PURPLE period, and see the full safe sleep checklist.

Questions parents ask

When should I stop swaddling?

At the first signs of rolling, whatever your baby's age. The AAP notes some babies start working on rolling as early as 2 months. The risk is that a swaddled baby rolls onto their tummy and cannot use their arms to roll back.

Arms in or arms out?

The AAP says there is no evidence on SIDS risk for arms in versus arms out. Once your baby shows signs of rolling, the Lullaby Trust says to stop swaddling with the arms wrapped inside.

Does swaddling reduce the risk of SIDS?

No. The AAP is clear that swaddling does not reduce SIDS risk. Some families use it because it can calm a newborn.

Can I swaddle my baby if we co-sleep?

No. The NHS and the Lullaby Trust both say never swaddle a baby when bed sharing. The Lullaby Trust adds: not when your baby has an infection or fever either.

Sources

  1. HealthyChildren.org (AAP) — Swaddling, is it safe for your baby? checked October 13, 2026
  2. The Lullaby Trust — How to swaddle your baby checked October 13, 2026
  3. HealthyChildren.org (AAP) — How to keep your sleeping baby safe, AAP policy explained checked October 13, 2026
  4. NHS — Sudden infant death syndrome (SIDS), co-sleeping more safely checked October 13, 2026

Mamavela explains; it does not replace your midwife, doctor or pediatrician, who know your situation. If something worries you, call them. In an emergency, call 911 (US), 999 (UK) or 112.

Read next

Sleep sacks and TOG ratings: how to choose and use a baby sleeping bagTOG explained, room temperature, fit by weight and the features that make a sleep sack safer.Safe sleep for babies: the rules that lower the risk of SIDSBack to sleep, a firm flat bare crib, room sharing, the right temperature: the AAP 2022 and NHS rules in one checklist.Newborn sleep schedule: what a real day looks like (with flexible examples)How newborns sleep in the first weeks, two flexible example days and the day-night habits that help.PURPLE crying: understanding the hardest weeks, and getting through themThe six letters of PURPLE, normal crying by age, soothing ideas, a step-by-step plan for when you are at your limit.