How to Swaddle a Baby: Step-by-Step Instructions

A snug swaddle starts with a thin blanket laid in a diamond, arms wrapped down, and legs left loose enough to bend — with the baby always placed on the back to sleep.

Few things settle a newborn faster than feeling wrapped and contained, and few things undo that calm faster than a wrap that traps the arms or pins the legs. Get the blanket tight around the chest, loose around the hips, and you have both a calmer baby and a safer one.

The method below takes about a minute once you have done it twice. It follows the technique published by the American Academy of Pediatrics on HealthyChildren.org, so the steps are the ones pediatricians actually teach.

How Do You Swaddle a Baby Step by Step?

Swaddling a baby means wrapping the infant snugly in a thin blanket so both arms are secured against the body while the hips and legs keep free range of motion, then placing the baby down on the back to sleep.

Work on a flat surface with a thin, lightweight blanket — muslin or a receiving blanket works well. A thick or heavy blanket traps too much heat and makes the wrap hard to tighten correctly.

1. Spread the blanket flat in a diamond shape, then fold the top corner down to create a straight edge.
2. Lay the baby face-up with the head above the folded edge and the shoulders just below it.
3. Bring one side of the blanket across the baby’s body and tuck it under the opposite side of the back.
4. Fold the bottom corner up loosely so the feet are covered without pressing the legs straight.
5. Bring the other side across and tuck it under the baby’s body to finish the wrap.

When the wrap is done you should be able to slide two or three fingers between the blanket and the baby’s chest. That chest fit is the tight part. The hips are the loose part — a hand should still pass under the legs, and the knees should stay free to bend.

What Does a Safe Swaddle Actually Feel Like?

A correct swaddle is firm across the chest and shoulders and relaxed across the hips, with no fabric anywhere near the face, chin, or neck.

Fit is the single thing parents get wrong most often, and it swings both ways. A wrap so loose it can work itself undone becomes a blanket over the face during sleep. A wrap so tight it flattens the chest restricts breathing, and one that pins the legs straight down limits the hip movement babies need for normal development.

Watch for these five mistakes:

• Swaddling with the baby on the stomach or side instead of the back.
• Straightening the legs and wrapping them tightly together.
• Pulling the blanket across the chin, mouth, or neck.
• Tightening until the chest cannot expand freely.
• Continuing to swaddle after the baby starts trying to roll.

Once the blanket is snug and flat, place the baby down on the back — every nap and every night. The American Academy of Pediatrics is clear that swaddled babies go down on the back, and the Michigan Department of Health and Human Services repeats that same rule in its safe-sleep guidance. Swaddling does not lower the risk of sudden unexpected infant death, so it sits alongside safe-sleep basics like a firm mattress and a clear crib rather than replacing them.

If you would rather skip the folding entirely, a zip-up or Velcro-style swaddle sack removes the loosening risk altogether. Our roundup of the best baby swaddle sacks for newborns covers the options worth buying.

When Should You Stop Swaddling?

Stop swaddling as soon as the baby shows signs of trying to roll over — that is the point where the wrap becomes a hazard rather than a help.

Rolling attempts usually show up somewhere between two and four months, though every baby moves on their own schedule. The signal is specific: the baby rocks to one side, kicks a leg across the body, or starts working a shoulder toward the mattress. A swaddled baby who rolls onto the stomach can end up face-down with the arms trapped, unable to push back over — which is why the arms come out of the wrap the moment rolling begins. Children’s Healthcare of Atlanta’s safe-swaddling guidance frames it the same way: cover the baby, leave the hips room, and treat arm freedom as the first step out of the swaddle.

When that day comes, try one arm out first for a few nights, then both. Most babies adjust within a week, and a sleep sack with free arms takes over from there.