Swaddle Get the app

How to swaddle a baby safely, step by step

By the Swaddle team · Reviewed October 25, 2026

Swaddling means wrapping a baby snugly in a thin blanket so their arms are held close. Many newborns settle more easily when swaddled, because it calms the startle (Moro) reflex that can jolt them awake. It is optional: some babies hate it, and that is fine.

What you need

  • A large, thin, breathable square blanket (muslin or light cotton), about 40 x 40 inches (100 x 100 cm), or
  • A swaddle sack with velcro, zips or wings, which is easier at 3 am

How to swaddle with a blanket

  1. Make a diamond. Lay the blanket flat like a diamond and fold the top corner down about 6 inches (15 cm).
  2. Place your baby on their back with their shoulders just below the fold.
  3. First side. Hold your baby’s right arm straight by their side. Bring the left side of the blanket (from your baby’s right) across their body and tuck it under their left side. The left arm stays free for now.
  4. Bottom up, loosely. Bring the bottom corner up over the feet. Leave plenty of room so the legs can bend up and out at the hips. Tuck it loosely into the top of the first fold.
  5. Second side. Hold the left arm by their side. Bring the right side of the blanket across and tuck it under your baby’s back.

Check: snug around the chest (two or three fingers’ space), loose at the hips, nothing near the face.

The safety rules

  • Always on the back. Never place a swaddled baby on their side or tummy.
  • Hips free. Legs should be able to bend up and out like a frog. Tight wrapping with straight legs is linked to hip problems.
  • Not too warm. The swaddle counts as a layer. No hats indoors. See what to wear to sleep.
  • Nothing extra in the crib. No pillows, bumpers, loose blankets or toys.
  • No weighted swaddles or sleep sacks. The American Academy of Pediatrics advises against them.
  • Stop when your baby starts trying to roll. Read when to stop swaddling.

If your baby fights the swaddle

Some babies love their hands near their face. Try an arms-up swaddle sack, or one arm out. Others simply prefer no swaddle at all. A calm routine, a dark room and steady white noise help with or without one.

Questions parents ask

Should I swaddle my newborn?

You do not have to. Swaddling can help some newborns settle by calming the startle reflex. If you swaddle, always place your baby on their back and stop once they show signs of rolling.

How tight should a swaddle be?

Snug around the chest, with room for about two or three fingers between the blanket and your baby's chest, and loose around the hips so the legs can bend up and out.

Should I swaddle with arms up or down?

Either can be safe if the swaddle is snug and the baby is on their back. Some babies settle better with hands near the face. Swaddle sacks with arms-up designs are an option.

Is it safe to swaddle for naps?

Yes, with the same rules: on the back, on a firm, flat surface, not too warm, and only until your baby starts to roll.

Sources

  1. American Academy of Pediatrics: Swaddling: Is it Safe? (healthychildren.org)
  2. International Hip Dysplasia Institute: Hip-healthy swaddling
  3. The Lullaby Trust: Swaddling your baby

This page is general information from the sources above, written by the Swaddle team and last reviewed October 25, 2026. It is not medical advice and it is not a substitute for your pediatrician. Every baby is different. If something feels wrong, call your doctor. In an emergency, call 911 (US) or your local emergency number. How we write these pages.

Keep reading

When to stop swaddling: signs, age and how to transition

Stop when they start trying to roll. Signs, age and gentle ways to transition.

What to wear to sleep

Room temperature in, TOG and layers out.

Newborn sleep schedule

Wake windows, naps and a sample day at 0-6 weeks.

White, pink and brown noise

Play steady noise in your browser, with a timer and safe-volume tips.