How to Swaddle a Baby Safely, Step by Step

A safe swaddle is snug on the chest, loose around the hips, and used only for a baby sleeping on the back who is not trying to roll. This guide gives step by step instructions for a thin blanket and for a zip and Velcro swaddle. The steps come from the American Academy of Pediatrics (AAP), the International Hip Dysplasia Institute (IHDI), NIH Safe to Sleep and the brand’s own how-to page. They are researched from published guidance, not tested in our own lab, as explained on How we score. This is general information, not medical advice. Ask your pediatrician about your own baby.

Is swaddling safe, and when should you stop?

Swaddling is an option, not a requirement, and it comes with firm limits. The AAP’s parent guide says swaddling does not reduce the risk of SIDS. It also says to stop as soon as your baby shows any sign of trying to roll over. The AAP swaddling page notes that some babies begin working on rolling as early as 2 months, and the AAP safe sleep guide says rolling over usually happens around 3 to 4 months but can happen earlier, so watch your own baby instead of a calendar date.

Three more rules come straight from the AAP and NIH Safe to Sleep:

• Back only. Place a swaddled baby on the back, on a firm, flat surface, every time, for naps and nights.
• Nothing loose in the crib. The AAP warns that a swaddling blanket that comes unwrapped can cover a baby’s face. Safe to Sleep lists blankets that are tucked in or non-fitted among the things to keep out of the sleep space.
• No weighted swaddles. Both the AAP and Safe to Sleep say not to use weighted swaddles or weighted blankets.

How do you swaddle a baby with a muslin blanket?

Use one thin square blanket, wrap the arms and chest snugly, and leave the legs free to bend up and out. The steps below follow the AAP’s HealthyChildren.org instructions and the IHDI’s hip-healthy method. Practice once or twice while the baby is awake, so the sequence is familiar before a tired night.

1. Lay the blanket flat as a diamond, then fold the top corner down to make a straight edge.
2. Lay the baby face up with the shoulders level with that straight edge and the head above the blanket.
3. Straighten the left arm gently along the body. Pull the left corner of the blanket across the chest and tuck it under the baby’s right side, between the right arm and the body.
4. Bring the right arm down. Fold the right corner across the baby and tuck it under the left side. The IHDI notes that the baby’s weight holds the cloth in place.
5. Take the bottom of the blanket, fold or twist it loosely, and tuck it under one side. Both legs must stay bent up and out. Never pull the bottom tight over straight legs.
6. Do the two checks from the AAP and IHDI. Slide two or three fingers between the baby’s chest and the wrap. Then confirm the hips and knees can move freely.
7. Place the baby on the back on a bare, firm, flat mattress and check that no fabric can reach the face.

How do you use a zip and Velcro swaddle?

Pick the size by the brand’s chart, keep the leg pouch loose, and fasten every closure so no wing can lift. Zip-up swaddles replace the folding, but the same hip and chest rules apply. The IHDI says commercial swaddles should have a loose pouch or sack for the legs and feet, and that some can confine the legs if tightened around the thighs.

The LullaBaby Double Dream Swaddle is the example here because its brand page publishes a short sequence ($39.99 on the brand store, read Oct 23, 2026). From that how-to page:

1. Place the baby in the middle of the unzipped swaddle.
2. Bring the inner wings over the baby’s arms and then under the baby’s body.
3. Zip it up.
4. Fold the left outer wing across the baby’s body.
5. Secure the right outer wing across the body with the Velcro.
6. Check chest room with two or three fingers, check that the legs can bend up and out in the pouch, then lay the baby on the back.

The brand’s own page says the swaddle must be securely fastened and that you should stop when the baby shows signs of rolling over or breaking out of it. Steps 1 to 5 come from the brand page. Step 6 is the AAP and IHDI check applied to it. The brand page we read gives no hip statement and no weight ranges, and the IHDI hip-healthy list does not name it. Our review has the full evidence: LullaBaby Double Dream Swaddle review.

What are the common swaddling mistakes?

The big ones are tight legs, a loose wrap, too much warmth and swaddling past the rolling stage.

• Legs pulled straight and pressed together. The IHDI says this can raise the risk of hip dysplasia and dislocation.
• A blanket that can unwrap. A loose end near the face is the hazard the AAP describes.
• Overheating. The AAP says swaddling can raise the chance of overheating. Signs it lists are sweating, damp hair, flushed cheeks, heat rash and rapid breathing. Use one thin layer, not a thick blanket.
• Swaddling after rolling starts. Stop at the first attempts to roll. A sleep sack that leaves the arms free is the AAP’s preferred alternative to loose blankets.
• Adding weight. Skip weighted swaddles, rice bags and weighted blankets.
• Wrapping in a car seat, bed or sofa. Safe to Sleep says to move a baby who falls asleep in a seat to a flat sleep space as soon as possible.

How do you pick the right warmth?

Match the swaddle’s TOG rating to the room temperature the brand publishes, and dress the baby for the room. TOG is a warmth rating, and a higher number is warmer. The LullaBaby page lists an estimated 1.0 TOG for 68 to 75 F, labeled as the brand’s estimate. The AAP’s parent guide says a baby needs about one more layer than you would wear in the same room.

When should you replace a swaddle?

Replace it when it no longer fits, when a closure fails, or when the baby is rolling. Check zippers, Velcro and seams on every wash. Follow the care label, and close zips and Velcro before washing, as the brand instructs. Retire any swaddle with a frayed seam or a closure that no longer holds. Check SaferProducts.gov before buying secondhand.

If you are comparing products, see our researched list: The Best Swaddles of 2026. For the rest of the nursery, start at Baby gear.

FAQ

Can a swaddled baby sleep on their side or stomach?

No. The AAP says to place swaddled babies only on their back, and to monitor them so they do not roll over.

How tight should a swaddle be?

Snug across the arms and chest, with two or three fingers able to fit between the chest and the wrap (AAP). The hips and knees should move freely (IHDI).

Arms in or arms out?

The AAP says there is no evidence on SIDS risk related to the arms being in or out. Either way, the safe sleep rules above still apply.

Is a weighted swaddle okay?

No. The AAP and NIH Safe to Sleep both say not to use weighted swaddles.

Where can I ask hip or sleep questions?

Ask your pediatrician. The IHDI also publishes a hip-healthy swaddling page with a video of three methods.