The Best Sleep Sacks, Tested by Parents and Approved by Babies

Better sleep for baby (and mom)

PureWow editors select every item that appears on this page, and the company may earn compensation through affiliate links within the story. All prices are accurate upon date of publish. You can learn more about the affiliate process here.

best sleep sacks universal
Digital Art by Alexia Dellner

Every parenting journey is unique, but what we can all agree on is that you'll do anything for more sleep. Which is why finding the right sleep sack for your child is a serious task. Too itchy or too hot and it will keep them up all night. Too difficult to undo and you'll wake them up while changing their diaper. It’s an important item, for sure, but it may also get stained and dirty so you don’t want to spend too much money on it (not to mention they'll likely grow out of it in a few months). No wonder it’s so confusing! But don’t fret—we've done the research for you and uncovered the best sleep sacks on the market so you and yours can get a decent night's slumber (maybe).

But what is a sleep sack, anyway? A sleep sack is a baby-safe blanket. Since blankets are not advised before 12 months, sleep sacks are a safe solution to keep your little one cozy so they can drift off to dreamland. Sleep sacks are sometimes referred to as wearable blankets, and are often what baby will wear when it is no longer recommended to swaddle your baby (usually around two months or when they start to show signs of rolling over).

The Best Sleep Sacks


Best Overall

Happiest Baby Sleepea 5-second Swaddle

read more


Best All-Season

Halo Sleep Sack Swaddle

read more


Best Lightweight

Burt’s Bees Baby Wearable Blanket

read more


Prettiest Designs

pehr Sleep Bag

read more


Softest Fabric

Kyte Baby Bamboo Rayon Sleep Sack

read more

Show More

Meet the Expert

 Navya Mysore, MD is a primary care provider at One Medical based in Brooklyn, NY. She completed her family medicine residency and maternal child health fellowship at McGill University and is certified by the American Board of Family Medicine and the College of Family Physicians of Canada.

How We Chose the Best Sleep Sacks

There are a lot of sleep sacks out there! To narrow down the list, we interviewed parents, vetted reviews and tried sleep sacks firsthand to bring you our top picks. Features we were looking for included: comfort, safety, ease-of-use and affordability. 

Want to know which buzzy products are *really* worth buying? Sign up for our shopping newsletter to uncover our favorite finds.

Best Overall

1. Happiest Baby Sleepea 5-second Swaddle

What We Like

  • 2-way zipper closure
  • mesh panels

What We Don’t Like

  • some reviewers say sizing chart isn't accurate and you should buy a size up

Happiest Baby

This 100 percent cotton sleep sack was rated the #1 swaddle by the New York Times. Rightfully so, since it features seasoned-parent hacks like a two-way zipper for easy diaper changes and super quiet velcro to keep those squirmy little ones swaddled tight. The medium and large sizes even have snap buttons on the arm holes so you can swaddle baby’s arms in or out depending on their preference and stage. Icing on the cake—it was designed by a pediatrician and baby whisperer Dr. Harvey Karp.

“I didn't even own the fancy Harvey Karp bassinet, but I found his sleep sacks to be the absolute best and most dummy-proof for me with my son,” says PureWow Senior Director of Special Projects, Rachel Bowie. “The zipper setup was a cinch (and quiet), but I also really liked the mesh panels, which made me stress less about overheating. He could escape almost every other swaddle, but this one was a winner for us!”

Fast Facts:

  • Sizes available: newborn, small, medium, large
  • Material: organic cotton
  • Closure: zipper

Best All-Season

2. Halo Sleep Sack Swaddle

  • 2-way zipper
  • three ways to wear

What We Don’t Like

  • Velcro panel is loud


PureWow's VP of Editorial Candace Davison raves about this sleep sack because of how affordable and easy to use it is, and Dr. Mysore used it for both her boys as well. The large extended wings can be used three ways: arms in to reduce the startle reflex, hand-to-face for self-soothing, or one or both arms out for when your baby is ready to transition out of a swaddle and into a pure sleep sack. It comes in several patterns and sizes, is made of 100 percent cotton and unzips from the bottom to make diaper changes extra easy. The biggest downside is that the large Velcro panel isn’t exactly quiet when you undo it, so keep that in mind for those middle-of-the-night changes.

Fast Facts:

  • Size range: preemie, newborn, small, medium
  • Material: cotton
  • Closure: zipper

Best Lightweight

3. Burt’s Bees Baby Wearable Blanket

What We Like

  • cute designs
  • lightweight

What We Don’t Like

  • some reviewers say the zipper can be finicky

Burt's Bees

Burt’s Bees is pretty much synonymous with cool baby gear. This lightweight option (0.5 TOG) is made of 100 percent cotton that allows baby to move around comfortably and safely. It has a zipper that opens from the bottom for easy diaper changes and comes in super cute colors. It’s a great option for travel because it folds up easily and would work well for warmer temps.

“I have used Burt's Bees exclusively since my son was four months old,” says Operations Director of Branded Content Rachel Gulmi. “He runs warm so I like that its only 0.5 TOG and the cotton is so comfortable. And they hold up extremely well to washing.”

Another PureWow editor and mom-of-two also loves this pick, telling us that she has the 1.5 TOG wearable blankets “and they’re just the perfect mid weight.”

Fast Facts:

  • Size range: small, medium, large, 18 months
  • Material: cotton
  • Closure: zipper

Prettiest Designs

4. pehr Sleep Bag

What We Like

  • beautiful designs
  • luxurious feel

What We Don’t Like

  • only two sizes available
  • expensive


This may well be the dreamiest sleep sack out there, thanks to whimsical designs like Luna Dawn and Secret Garden and the 100 percent organic cotton exterior (the interior is hypoallergenic polyester fiberfill). It’s pricier than some of the other options available, but happy customers report that airy yet plush design is worth the cost. Available in two sizes (0 to 9 months and 9 to 18 months), the smaller size has under-arm snaps to keep up with your growing baby, and both options unzip side to bottom for easy diaper changes.

Senior Food Editor Katherine Gillen is a big fan: “I have the 1.7 tog and plan on buying the 1 tog for warmer weather months. I love that these are muslin cotton. The 1.7 tog has a light layer of fluffy filling between the cotton and it's warm without being too hot, so I don't worry about my gal overheating. I also like that there are snaps on the sides to make it bigger or smaller and stretch out the length of time you can use it, since it is pretty price.”

Fast Facts:

  • Size range: 0 to 9 months, 9 to 18 months
  • Material: cotton and polyester
  • Closure: none

Softest Fabric

5. Kyte Baby Bamboo Rayon Sleep Sack

What We Like

  • super soft

What We Don’t Like

  • pricey
  • brand controversy


We debated whether or not to include this option due to the recent Kyte controversy where it was revealed that the company denied a new mom’s request to work remotely while she cared for her premature newborn in the NICU. Many formerly loyal customers have since taken to social media to voice their outrage and decision to now boycott the company. And we can’t say we blame them.

However, when asking moms about their favorite sleep sack, multiple parents told us that they were obsessed with the Kyte version. And so we’ll leave the decision up to you. What our moms love is the super duper soft bamboo rayon fabric that feels like butter and the J-shape double zipper for easy diaper changes. There are also a lot of color options available and the sleep sacks holds up well after multiple washes.

Fast Facts:

  • Size range: XS, S, M and L
  • Material: bamboo viscose and spandex
  • Closure: zipper

Most Splurge-worthy

6. Woolino 4 Season Ultimate Organic Cotton & Merino Wool Wearable Blanket

What We Like

  • can be used for all seasons
  • wide age range

What We Don’t Like

  • expensive


This sleep sack reminds us of the KYTE version, above, but with a few notable differences. It is lined with merino wool, making it super luxe and cozy, no matter the season. However, even though it’s fancy, it’s not high maintenance. Throw this bad boy in the washing machine with your other laundry and it will be good to go. It also features shoulder straps and a bottom zip closure, so regardless of what Baby has gotten himself into, there’s always a convenient and clean way to get him changed (IYKYK).

“I found the Woolino sleep sack through a friend's endorsement of it — the age ranges are broad: 2 months to 2 years for example; 2 to 4 years, etc.” says Bowie. “What I love is that it's seasonless. Your kid can sleep in it in the winter, but also the summer due to the fact that it's made from merino wool, which helps keep baby warm when it's cold and cool when it's warm. (It also comes with a handy how to dress your baby guide based on the temp.) But it's basically the definition of a wearable blanket — and TBH, my son always looked so cute when he woke up in it. You can also keep the shoulders snapped, but unzip the bottom, so that your kid can toddle around with it still on.” (It's also a favorite of Dr. Mysore who calls it "cozy, warm and safe!")

Fast Facts:

  • Size range: 2 months to 2 years, 2 years to 4 years
  • Material: 100 percent merino wool lining, 100 percent organic cotton outer
  • Closure: double shoulder snaps and two-way zipper 

Best for Transitioning Out of the Swaddle

7. SleepingBaby Zipadee-Zip Sleep Sack

What We Like

  • great for transitioning out of the swaddle
  • lots of size options

What We Don’t Like

  • some daycares won’t allow them


Just when your kid starts sleeping more than two hours at a time, they learn how to roll over. And so it’s time to say goodbye to the swaddle and introduce a sleep sack. Except your previously constrained kid doesn’t know what to with all that freedom. Suddenly, they’re awake at 3 a.m. playing with their hands because, well, they haven’t been able to do that before! And if you don’t like trimming those fingernails (guilty), expect a lot of scratches in the morning. Enter: The Zipadee.

Executive Editor Alexia Dellner raves about it: “I loved this sleep sack for my son when he transitioned out of the swaddle. It's soft and cozy, and mimicked some of that snugness of the swaddle but still allowed for plenty of movement (seriously—he wore these for months and could crawl, stand and walk around in it!). It's lightweight but because it offers full coverage, we were able to use it throughout the seasons. The only downside was that I tried to use them for my daughter too but her daycare wouldn’t allow them (something about not having her hands free?) so that was a bummer.”

Fast Facts:

  • Size range: 3 to 6 months, 4 to 8 months, 6 to 12 months, 12 to 24 months, 2 to 3 years
  • Material: polyester and spandex
  • Closure: zipper

Best for Cold Weather

8. Simple Joys by Carter's Unisex Babies' Microfleece Sleepbag 

What We Like

  • super warm
  • sleeves

What We Don’t Like

  • not breathable


When temperatures drop, you want a sleep sack that will keep your kid nice and cozy. Enter: the microfleece sleep sack from Carter’s. It’s super soft and warm, features a zipper for quick diaper changes (plus a safety tab to keep the zipper away from baby's chin) and comes in a variety of cute prints.

“I've used a fleece Carter's sleep bag on realllly cold nights and it's great,” says Gillen. “It has sleeves for extra warmth and the most essential of all, a two way zipper! (Plus, it's less than 20 bucks and you can't beat that.)”

Fast Facts:

  • Size range: 0 to 3 months, 3 to 6 months, 6 to 9 months
  • Material: polyester
  • Closure: zipper

What to Consider When Buying a Sleep Sack

  • Fit: Use size charts to make sure your baby’s sleep sack fits properly. While some sleep sacks are more form-fitting than others, a general rule of thumb is that no sleep sack should ever be so baggy that it bunches up near your child’s face, which can be dangerous. You especially want sleep sacks to fit snug when Baby is tiny and can’t roll over or pull fabric away from their own face.
  • Safety: "You want to make sure that the baby is safe and comfortable," says Dr. Mysore. While you don’t want too much bagginess around a child’s face, you do want space for their legs to move. Specifically, you want to ensure that there’s enough room for babies to frog-leg their hips wide open—an important movement for their development. You also want to ensure that the sleep sack is free from choking or strangulation hazards, like loose ribbons, bows or buttons.
  • Fabric: "You want to make sure that the material is breathable and doesn't allow for the baby to overheat with the sleep sack on overnight," says Dr. Mysore. "Look for fabrics that are soft to the touch on both the exterior and interior of the garment. Cotton and cotton blends are great for softness. For colder climates in the winter a wool/cotton blend can be good for warmth."
  • TOGs: When browsing sleep sacks, you may see something called a “TOG” rating. TOG, or Thermal Overall Grade, tells you how much insulation a sleep sack provides. Lower TOG ratings, like 0.5 are lighter weight and better for warmer temperatures. Higher TOG ratings, like 2.5, are best for super cold temps. Reference a reliable TOG rating chart if you’re unsure of which weight is best for your child’s nursery.

Frequently Asked Questions

When to Start Using a Sleep Sack?

If you have a newborn, you’ll want to start with a swaddle rather than a sleep sack. Swaddles keep babies wrapped up tight, which is great for comfort and safety at their young age. Around 8 weeks, or whenever they start to roll over, it’s important to let their arms free and transition to a sleep sack, says the American Academy of Pediatrics. This way, if Baby rolls over in their sleep, their hands are free to flip back.

When to Stop Using Sleep Sacks?

When your child stops using sleep sacks is kind of up to them. Some babies will want to transition to a blanket around their first birthdays, while others might want to wear them well into their twos or threes. If your toddler is still loving their sleep sack, that’s great! Just size up when necessary to keep them comfortable and safe.

Do Pediatricians Recommend Sleep Sacks?

The American Academy of Pediatrics does not have any specific recommendations regarding sleep sacks, although they do stress that infants should sleep on their backs on flat non-inclined surfaces without soft bedding. Sleep sacks are a safer alternative than blankets and other bedding, but it is important to note that the AAP says that weighted swaddles, weighted clothing or weighted objects (such as weighted sleep sacks) on or near the baby are not safe and not recommended. 

purewow author

Freelance Writer

Paige Doepke Liwanag lives in Chicago and has been working as a freelance writer since 2016 and writing fashion, beauty and home commerce content for PureWow since 2021. She's a...

img 0936

Executive Editor

Alexia Dellner is an executive editor at PureWow who has over ten years of experience covering a broad range of topics including health, wellness, travel, family, culture and...

Why You Should Trust Us

PureWow's editors and writers have spent more than a decade shopping online, digging through sales and putting our home goods, beauty finds, wellness picks and more through the wringer—all to help you determine which are actually worth your hard-earned cash. From our PureWow100 series (where we rank items on a 100-point scale) to our painstakingly curated lists of fashion, beauty, cooking, home and family picks, you can trust that our recommendations have been thoroughly vetted for function, aesthetics and innovation. Whether you're looking for travel-size hair dryers you can take on-the-go or women’s walking shoes that won’t hurt your feet, we’ve got you covered.