What's the Difference Between Swaddles and Sleep Sacks?

Swaddles and Sleep Sacks and Blankets, Oh My!

December 12, 2019

Swaddles and Sleep Sacks and Blankets, Oh My!

Swaddles and Sleep Sacks and Blankets, Oh My!
Swaddles and Sleep Sacks and Blankets, Oh My!

What diaper bag will hold the most stuff, how many bibs to register for, which stroller will be your go-to…we know there’s a lot to remember as a parent-to-be, whether you’re just beginning to think about creating your registry or you’ve been at your new parent gig for a few weeks already.

Safe sleep guidelines are a biggie. Knowing what’s safe and what’s not when it comes to baby sleep is pretty important, and since you’ve got a lot of nap times and bedtimes ahead of you, you’ll need to know what’s what when it comes to babies + blankets, swaddles and sleep sacks.

We’re making all your baby burrito dreams come true and sharing the need-to-knows around safe baby sleep solutions, from figuring out the differences between swaddles and sleep sacks to learning what’s safe to use and when.

Safe Sleep 101

The American Academy of Pediatrics has many resources on safe sleep that are helpful to familiarize yourself with before your little one arrives. In the meantime, here’s a basic breakdown of what they recommend:

  • Use a firm sleep surface.
  • Until their first birthday, always place your baby on their back for all sleep, including naps and at night.
  • Room share for the first six months, ideally up to the first year.
  • Never bring your baby into bed with you for sleep, and never let your little one sleep on a couch or armchair.
  • It’s okay to swaddle your baby—but make sure the swaddle isn’t too tight (or too loose), and stop as soon as your little one starts trying to roll over.
  • Keep objects (toys, stuffed animals, etc.) and loose bedding like pillows, quilts, blankets, etc. out of baby’s sleep space.

That last point—no blankets or other loose bedding in baby’s sleep space—is where things can get a bit confusing. If you’re having a baby during the cooler months, or your little one is sleeping in a cold room, you’ll want something to keep them warm. And that’s where swaddle blankets and sleep sacks come in.

What’s the difference between a swaddle blanket and a sleep sack?

It’s important to know the difference between a swaddle blanket and a sleep sack, as well as how and when to use each, as you figure out what to add to your baby registry or purchase yourself during those early newborn days.

A swaddle blanket is a blanket that’s designed for swaddling your newborn. Swaddling is a way of wrapping a blanket securely around your baby so they can’t wriggle out. (Cue all the adorable baby burrito photos.) Swaddling is great for a few reasons:

  • It keeps your baby feeling safe and secure, mimicking the tight feeling they experienced in the womb.
  • It prevents the newborn startle reflex from waking them up. (That’s what’s happening when you see your little one’s arms or legs jerk suddenly in their sleep.)
  • It keeps your little one warm without loose blankets.

There are two basic types of swaddles, traditional and 2-in-1s. A traditional swaddle blanket is a large, thin blanket, usually made of a soft, stretchy fabric like muslin, cotton or bamboo. Two-in-one swaddles let you wrap your little one snugly or leave their arms out. They often come with features like snaps, zippers or Velcro that help make swaddling easier and ensure the swaddle stays secure.

A sleep sack is like a mini sleeping bag for your baby and toddler. Sometimes also called a wearable blanket, a sleep sack is another alternative for keeping your little one warm without using loose blankets in the crib. Sleep sacks are usually made of cotton, fleece or wool and feature zippers and snaps for easy on and off.

When to transition from a swaddle to a sleep sack

The AAP says that, when done correctly, swaddling is safe and can be an effective tool for helping calm your little one and promote longer stretches of sleep. But it’s important to know when to stop swaddling and transition to a sleep sack instead.

You should stop swaddling your baby when they begin trying to roll over. Timing will vary for every baby, but this milestone usually happens around four months old. Swaddling can be dangerous for rolling babies—they won’t have their arms free, so if they roll over while swaddled it can place them in an unsafe sleep situation.

Babylist Picks for the Best Swaddle Blankets and Sleep Sacks

If you’re thinking of adding swaddles and sleep sacks to your baby registry, we recommend starting small. Pick one traditional-style swaddle and one or two 2-in-1 styles, then wait until your little one arrives to figure out which swaddle you (and your baby!) like the best. Same goes for when it’s time to transition to a sleep sack; try one or two first, then build from there.

Here are our top picks for safe sleep solutions in every category.

Tried and True

There’s a reason these muslin swaddles have remained a registry staple for years. They’re light, breathable, come in a huge assortment of great prints and are versatile enough to use beyond just swaddling.

Soft and Stretchy

For a alternative to muslin, Copper Pearl’s soft, stretchy rayon blend swaddle blanket gets our vote. We love the extra-large size and signature patterns.

Hands Up, Baby, Hands Up

This simple, creative swaddle sack solves for the fact that babies’ natural sleep position is often with their arms up. It gives them access to their hands for self soothing but simultaneously helps to manage the startle reflex.

100% Foolproof

We love the unique and foolproof design of this quick and easy swaddle sack. There’s an inner band that keeps baby’s arms snug and secure paired with a zip-up, hip-safe outer sack for warmth and comfort. And the Velcro is extra quiet, too.

Great Transition

When your little one is ready to transition from a swaddle blanket to a sleep sack, simply stop using the Velcro wings of this popular swaddle to let their arms out. We also like the mid-weight cotton material here that works for a variety of sleep environments.

Parent Favorite

This is the wearable blanket of choice once it’s time for your baby to make the transition from swaddle to sleep sack. The simple design, bottom-up zipper (great for nighttime diaper changes) and affordable price point make the Halo a parent favorite.

Eco-Friendly

For an eco-friendly sleep sack option, the Kyte Baby sleep bag is the way to go. It’s made from breathable, ethically sourced bamboo and works in sleep spaces with an ambient temperature between 69 and 73 degrees Fahrenheit.

For a full selection of our favorite swaddles blankets and sleep sacks, check out our Best Swaddles and Best Sleep Sacks guides.

This information is provided for educational and entertainment purposes only. We do not accept any responsibility for any liability, loss or risk, personal or otherwise, incurred as a consequence, directly or indirectly, from any information or advice contained here. Babylist may earn compensation from affiliate links in this content. Learn more about how we write Babylist content.