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Best Sleep Sacks
Updated on
January 4, 2024

Best Sleep Sacks

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Best Sleep Sacks.
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Best Sleep Sacks

Sleep sacks are more than just adorable mini sleeping bags for your baby and toddler. Designed to help reduce the risk of SIDS, sleep sacks (also called wearable blankets or sleep bags) offer a safer alternative to loose blankets in the crib, which is a major no-go according to the American Academy of Pediatrics’ safe sleep guidelines.

From cotton, fleece and wool to newborn-friendly picks and footed options for toddlers, there’s a huge variety of sleep sacks available. We’re sharing our favorites for every age, stage and sleeping environment so you can figure out what’s best for your little one.

Babylist’s Top Picks for the Best Sleep Sacks

Babylist’s Picks for the Best Sleep Sacks

Best Sleep Sack Overall

Why We Love It

Easy to get on and off, affordable, washes and wears well and made from soft, comfy cotton—there’s so much to love about this HALO sleep sack. It’s the perfect choice to replace loose blankets in the crib while still giving your little one the feeling of security. There are lots of colors and sizes to choose from and an inverted zipper that opens and closes from the bottom for easy diaper changes.

Keep in Mind

Looking for a warmer option when the temperature drops? There’s a cozy microfleece option. Need something that adjusts to a range of temperatres? We like Halo’s Ideal Temp Wearable Blanket.

Best Organic Sleep Sack

Why We Love It

If organic cotton is important to you, then this wearable blanket from Tiny Kind makes a great choice. The fabric is soft and lightweight, yet still warm, and there’s plenty of room in the lower half for your little one to kick and move their legs around freely.

Keep in Mind

This sleep sack is made from 100% GOTS-certified organic cotton. The inks are organic and non-toxic, and the boxes used by the factory are made from recycled fabric straps converted into paper pulp.

Best Newborn Sleep Sack

Why We Love It

Part sleep sack + part swaddle, this creative hybrid is a great option for babies who may not like the tightness of a traditional swaddle blanket but aren’t quite ready for a sleep sack. The Swaddle UP lets your little one sleep with their arms up, a natural position that also gives them access to their hands for self-soothing. It’s soft and breathable, easy to use and, it must be said, makes every baby look even cuter than normal while using it.

Keep in Mind

Unlike traditional arms-out sleep sacks that can be used well into toddlerhood, you’ll need to ditch this one when baby starts rolling over independently.

Softest Sleep Sack

Why We Love It

Made from breathable material and ethically sourced from sustainable bamboo, this sleep sack is not only gentle on your little one—it’s also gentle on the planet. Parents rave about how soft and comfortable it is. (And they’re right!) We also love the beautiful color choices.

Keep in Mind

Wondering what TOG stands for? Thermal Overall Grade, which indicates how much heat the fabric retains. Look for a lower TOG if you live (or sleep) in a warmer climate, and a higher TOG for cooler climates.

Best Sleep Sack for Winter

Why We Love It

If you live in a place where the winters get chilly (or you’re just trying to cut down on those heating bills), then you’re going to need an extra-warm sleep sack to keep your little one toasty warm. Made with thick, stretchy organic cotton and with a TOG of 2.5, this wearable blanket is like a tiny (but safe) luxury comforter made with your baby in mind. Its only downfall is it doesn’t come in adult sizes.

Keep in Mind

This sleep sack is designed for rooms 62-73°F. If you are looking for a warm, wearable blanket for a younger baby, check out ergoPouch’s Cocoon Swaddle Bag line. It starts as an arms-in swaddle then transitions to arms-out.

Best Lightweight Sleep Sack

Why We Love It

For just the opposite—a lightweight sleep sack just right for warmer climates—check out Crane Baby’s line of (beautiful) cotton sleep bags. They’re made from 100% cotton muslin that we swear gets softer after each and every wash. It’s a good choice for keeping your baby cozy in a warmer climate without the risk of overheating.

Keep in Mind

This sleep sack will work from birth until your baby is about nine months old. For those early days, there’s an adjustable underarm snap to help the sleep sack fit more snugly on your baby’s tiny body.

Best Swaddle Transition Sleep Sack

Why We Love It

This sleep suit may turn your little one into the Stay Puft Marshmallow Man, but we promise it’s worth the laughs. Many babies have trouble transitioning from the snugness and security of a traditional swaddle to the roominess of a sleep sack. The Merlin offers the perfect middle ground. It’s light enough to allow baby some freedom of movement, but heavy enough to quell the startle reflex, helping many babies sleep longer and sounder.

Keep in Mind

There are two important things to remember when using the Merlin. First, it’s warm. Skip the heavy PJs underneath and instead dress baby in a short-sleeved bodysuit. Second, it’s not safe to use once your little one starts rolling over, so be sure to transition to an arms-out sleep sack once your little one reaches that milestone.

Best Sleep Sack Swaddle

Why We Love It

For a swaddle that goes the distance with an arms in or out option, the HALO SleepSack Swaddle is a popular choice. It features foolproof Velcro wings that make it easy to wrap around and swaddle younger babies who need more security, then adjusts to an arms-out style for older babies who are beginning to roll over or for little ones who just aren’t digging the tighter swaddle. It’s made from mid-weight cotton so it’s suitable for a variety of different temperatures.

Keep in Mind

Parents’ biggest gripe? Undoing the Velcro makes a pretty loud noise that can startle or wake baby.

Best Wool Sleep Sack

Why We Love It

Wool is the ideal four-season material. It’s warm in winter, cool in summer and naturally regulates your body temperature. This sleep sack, made from Merino wool, will keep your little one at just the right temperature all year round. It’s machine washable and comes in an adjustable universal size that works for kids from two months to two years.

Keep in Mind

Definitely the most expensive sleep sack on our list, we realize the Woolino is a bit of an investment, but we think it’s worth it since it can be used all year long.

Best Sleep Sack for Toddlers

Why We Love It

Is your toddler on the move? Although you can certainly use traditional sleep sacks well into toddlerhood, some parents prefer the added mobility that a footed sleep sack provides. This one features a two-in-one design that converts from a traditional sleep sack to a sleep suit using four-way zippers. It works best for rooms 70-75°F.

Keep in Mind

Pro tip: If you have a crib climber on your hands, a footed sleep sack may not be the best choice. Stick with a traditional sleep sack that will sabotage those crib breakout attempts rather than a footed style that may make them easier.

This sleep suit bag also comes in a 0.3 TOG for warmer climates as well as 2.5 and 3.5 TOG options for chillier nights.

How We Chose the Best Sleep Sacks

  • We analyzed results from Babylist’s Best Baby Products survey, which polled 6,000 Babylist users and asked them to share the baby products they love the most and why.
  • We utilized insight from the Babylist editorial team, including Gear Editor Jen LaBracio, an expert in the baby space for over six years and a mom of two who has written hundreds of baby gear guides and personally researched and tested hundreds of baby products, including many sleep sacks.
  • We reviewed customer reviews from hundreds of real Babylist parents.

What Is a Sleep Sack?

The ABCs of safe sleep—babies should sleep alone, on their back and in a crib or bassinet with a firm, flat mattress and a fitted sheet—is a fast, easy way to keep safe sleep practices in mind for your infant and baby. But what if you’re having a baby during the cooler months, or your little one sleeps in a cool room? You’ll need a way to keep them warm and safe. Enter the sleep sack.

A sleep sack, also called a wearable blanket or a sleep bag, is like a mini sleeping bag for your baby and toddler. It’s a safe 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. They can also help discourage crib climbing if you have an adventurous little one who’s trying to make a break for it.

What’s the Difference Between a Sleep Sack and a Swaddle?

A swaddle blanket is a blanket that’s designed for swaddling, or wrapping, your newborn. Swaddling is a way of wrapping a blanket securely around your baby so they can’t wriggle their way out. Swaddling keeps your baby feeling safe and secure, can encourage longer stretches of sleep by preventing the newborn startle reflex and is a safe alternative to keeping your baby warm without the use of loose blankets. There are two types of swaddles: traditional (a large, thin blanket made from soft, stretchy fabric) and two-in-one swaddles (a swaddle that features snaps, zippers or Velcro to help it stay secure and can be used arms-in or arms-out).

A sleep sack is more like a sized-down sleeping bag with arm holes. It’s looser than a swaddle, allowing your baby’s arms and legs to move freely. A sleep sack can be used with both younger and older babies and even through toddlerhood.

What to Look for in a Sleep Sack

Shopping for a sleep sack? Here are a few features to keep in mind.

  • The right material. Do you live in a cooler climate or like to keep the thermostat low while you sleep? Look for a sleep sack made from a thicker, heavier material to keep your baby warm throughout the night. Live in a warmer environment? A lightweight sleep sack made from muslin or thin cotton is likely the best choice. (Pro tip: if you live in a place with four seasons, try a wool sleep sack. Wool naturally regulates body temperature and is ideal in any temp.) Also consider comfort; look for a sleep bag made from soft material that will be gentle on baby’s skin.
  • A proper fit. Make sure to follow the manufacturer’s fit guidelines when choosing a sleep sack. You want to be sure the sleep bag you choose fits your little one properly and isn’t too loose or too tight.
  • Washability. Poop explosion, anyone? A good sleep sack is one you can toss right in the washing machine (and ideally the dryer) for easy cleaning.
  • Secure closures. Look for a sleep sack with secure closures to keep it in place. Have a baby Houdini on your hands? Opt for zippers over snaps—they’re harder for your little one to undo. (Two-way zippers are ideal for easy diaper changes.)

Frequently Asked Questions

Are sleep sacks safe?

Yes, according to the American Academy of Pediatrics (AAP), wearable blankets are safe for use with babies. Just be sure your little one doesn’t overheat; the general rule of thumb is to dress your baby in one more layer than you’re wearing.

What is TOG?

TOG stands for Thermal Overall Grade, and it’s a measurement that indicates how much heat a fabric retains. Sleep sacks with a higher TOG are more heavily insulated and meant for cooler temperatures, while lower TOG sleep sacks are lighter-weight and better suited for warmer climates. Many manufacturers have TOG rating charts to help you figure out which one is right for your baby’s sleep environment.

When to transition from a sleep sack to a swaddle

Swaddling is safe when done correctly, but it’s important to know when to stop swaddling and transition to a sleep sack instead. According to the AAP, you should stop swaddling your baby as soon as they show any signs of trying to roll over. That’s because 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. Timing will vary for every baby, but some babies begin rolling as early as two months of age.

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 and review products, as well as the Babylist Health Advisory Board.