The 9 Best Sleep Sacks of 2021

Keep your baby comfortable and safe at night

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Best Sleep Sacks

Verywell / Sabrina Jiang

There is no shortage of baby products that will help keep your little one soothed and (ideally) sleeping through the night, but sleep sacks or wearable blankets are among the best. Sleepsacks help babies feel secure and offer parents a safe way to keep their child warm while they sleep. Designed to be worn year-round, sleepsacks are available in breathable, cozy, and extra-comfy materials.

To be totally honest, sleep sacks belong on the “must-have” list for all new parents. There are a lot of options on the market though, so if you’re shopping for one, here are some of the best sleep sacks available.

Our Top Picks
Designed to keep your baby’s temperature regulated, it also features two shoulder snaps for easy dressing.
Perfect for hot summer nights, its lightweight cotton will give your baby the comfort of a blanket, while still being breathable.
Best for Moro Reflex:
SwaddleMe Original Swaddle at Amazon
Made as a combo sleep sack and swaddle to help caregivers skip the swaddle learning curve, it also allows for easy diaper changes.
Great for keeping your little one warm if your home gets cold, it's made from thick, soft microfleece.
This has little feet holes that can be covered or opened depending on your baby's activities.
Made to work as a swaddle and, later, a transitional sleep sack, its cotton muslin material is safe for sensitive skin.
Ideal for babies that need hypoallergenic materials, it features organic cotton and an inverted zipper for diaper changes.
For the teeniest babies, this swaddle is safe for preemies up to 7 pounds and is made of super soft organic cotton.
It goes on over baby’s shoulders and has a diagonal double zipper that keeps the blanket in place but allows for easy access.

Best Overall: Woolino 4 Season Ultimate Baby Sleep Bag Sack

Woolino 4 Season Ultimate Baby Sleep Bag Sack
Pros
  • Shoulder snaps

  • Two-way zipper

Cons
  • Costly

Made from merino wool, this sleep sack is designed to keep your baby’s temperature regulated so that it’s warm without overheating whether it’s the middle of winter or the hottest day in July. It has two snaps at each shoulder so you can slip your baby in and out to put it on (rather than over the head) as well as a zipper at the bottom for easy diaper changes.

Finally, this sleep sack has amazing longevity, because it’s safe for babies as young as two months old up to two years.

Material: Merino wool | Age Range: 2 months old to 2 years old | Machine Washable: Yes

What the Experts Say

“The most important element in deciding whether a sleep sack, wearable blanket, or transitional swaddle is safe is to understand your child's capabilities and when they will be wearing it.” —Aubrie DeBear, Psy.D., Child Sleep Consultant & Expert for Tommee Tippee’s ‘Spill The Milk Series

Best for Summer: Baby Deedee Sleep Nest Lite Sleeping Bag Sack

baby deedee Sleep Nest Lite Sleeping Bag Sack
Pros
  • Reversible zipper

  • Shoulder snaps

Cons
  • Not designed for cold nights

For hot summer nights, this is the best sleep sack for your child. It’s made from lightweight 100 percent cotton so that it gives your baby the comfort of a blanket, while still being breathable to avoid overheating.

It has snap shoulders as well as a reverse zipper for easy diaper changes and is available in three different sizes ranging from newborn to three years old. This sleep sack is machine washable and available in several color opinions.

Material: Cotton | Age Range: Newborn to 3 years old | Machine Washable: Yes

Best for Moro Reflex: SwaddleMe Original Swaddle, Small 3-Pack

SwaddleMe Original Swaddle
Pros
  • Perfect for newborns

  • Easy to secure

Cons
  • Unsafe after baby starts to roll/2 months old

  • Baby will outgrow it quickly

In early infancy, babies like to be swaddled to help soothe their Moro (or startle) reflex, but since traditional swaddles can be difficult to use, this product is designed as a combination sleep sack and swaddle.

All you have to do is tuck your baby’s feet into the little pouch and then wrap the wings around their arms and secure them in a tight little swaddle. For diaper checks and changes, simply pull their legs out of the pouch and then pull it back up when you’re done.

Material: Cotton | Age Range: Babies weighing 7 to 14 pounds | Machine Washable: Yes

What the Experts Say

“Another benefit of sleep sacks is to provide babies with a feeling of security by enclosing their feet for a more womb-like environment.” —Aubrie DeBear, Psy.D., Child Sleep Consultant & Expert for Tommee Tippee’s ‘Spill The Milk Series

Best for Winter: HALO Sleepsack Micro-Fleece Wearable Blanket

HALO Sleepsack Micro-Fleece Wearable Blanket
Pros
  • Great for cold nights

  • Inverted zipper

Cons
  • Not recommended for babies under 10 pounds

If your home gets cold in the winter months, this is a great sleep sack to invest in because it’s made from thick, soft 100 percent microfleece. The wearable blanket goes over the baby’s shoulders and then stays put with an inverted zipper that’s designed for easy late-night diaper changes.

You can get this machine-washable sleep sack in a variety of colors and sizes to keep your little one warm up until they reach 28 pounds.

Material: Polyester microfleece | Age Range: Newborn to 24 months old | Machine Washable: Yes

Best for Toddlers: HALO Early Walker Sleepsack

HALO Early Walker Sleepsack
Pros
  • Great for walkers

  • Budget-friendly

Cons
  • Feet are not covered

This sleep sack’s design is a little different from the rest because it has little feet holes so that they can safely move around before bedtime, then once they’re asleep you can cover their toes back up to keep them warm throughout the night.

It’s made from soft microfleece and comes in three sizes for babies between 16 and 36 pounds.

Material: Polyester microfleece | Age Range: 12 months old to 24 months old | Machine Washable: Yes

Best for Newborns: HALO Sleepsack 3-Way Adjustable Baby Swaddle

HALO Sleepsack 3-Way Adjustable Baby Swaddle
Pros
  • User-friendly

  • Budget-friendly

Cons
  • Not recommended for preemies

  • Not recommended for babies after they can roll/2 months old

Babies as little as 6 pounds (and 19 inches long) can safely use this sleep sack which is designed to work as a swaddle and, later, a transitional sleep sack. It goes over the baby’s shoulders and has an inverted zipper down the front to secure it in place. Then, to swaddle your newborn, you just wrap the wings around their arms and secure them with the velcro tabs.

If your baby wants their arms out of the swaddle, simply wrap the wings around the baby’s torso instead to let their arms be free while still giving them the tight secure feeling of a swaddle. This sleepsack is made from 100 percent cotton muslin and is safe for the washer and dryer.

Material: Cotton muslin | Age Range: Newborn to 18 pounds | Machine Washable: Yes

What the Experts Say

”If your child is able to roll, you always want to ensure that they have the use of their arms in any transitional swaddle or sleep sack.” —Aubrie DeBear, Psy.D., Child Sleep Consultant & Expert for Tommee Tippee’s ‘Spill The Milk Series

Best Organic: Burt's Bees Baby Beekeeper Wearable Blanket

Burt's Bees Baby Baby Beekeeper blanket
Pros
  • Eco-friendly material

  • Lightweight

Cons
  • Not recommended for cold nights

Made from 100 percent organic cotton, this sleep sack is available in three sizes and various colors. It fits over the baby’s shoulders and has an inverted zipper down the front to keep the blanket in place while also allowing for easy diaper changes at night. This sleepsack is super soft, should not irritate the skin, and is machine washable.

Material: Organic cotton | Age Range: Not Listed | Machine Washable: Yes

Best for Preemies: Mama Cheetah Adjustable Swaddle Blanket Wraps

Mama Cheetah Adjustable Swaddle Blanket Wraps
Pros
  • Adjustable design

  • Preemie-friendly

Cons
  • Not recommended for babies above 7 pounds

For the teeniest babies, this sleepsack and swaddle combo is safe for preemies up to 7 pounds. It’s made from lightweight 100 percent organic cotton that is perfect for keeping your baby warm but with enough breathability to prevent overheating.

To use it, tuck your baby’s feet into the little pouch and then simply wrap the wings around your baby’s arms and use the velcro straps to secure it shut. For late-night diaper checks and changes, you can simply untuck your baby’s feet without having to undo their swaddled arms.

Material: Organic cotton | Age Range: Preemies (no babies above 7 pounds) | Machine Washable: Yes

Best Breathable: KYTE BABY Unisex Bamboo Rayon Sleeping Bag

Kyte Baby Sleep Bag
Pros
  • Silky smooth fabric

  • Three thermal resistances

Cons
  • Costly

Available in several colors and in sizes safe for babies from birth up to 3 years old, this sleep sack is made from super soft bamboo, with a hint of spandex, so it is cozy, warm, and breathable. It goes on over the baby’s shoulders and has a diagonal double zipper that keeps the blanket in place but also allows for easy access for diaper changes.

While it is hand wash only, this sleep sack is an especially excellent choice for babies with sensitive skin.

Material: Bamboo rayon | Age Range: Newborn to 3 years old | Machine Washable: No

Final Verdict

You really can’t go wrong with any of the sleep sacks on this list, because they’re all great. That being said, the Woolino 4 Season Ultimate Baby Sleep Bag Sack (view at Amazon) ranks highest on our list because of its breathable fabric, simple design, and longevity.

What to Look for When Buying a Sleep Sack

Safety

Ensure the sleep sack is the right size for your baby before purchasing it. Look at both the age and weight range to find the best fit. Also, Aubrie DeBear, Psy.D., Child Sleep Consultant & Expert for Tommee Tippee’s ‘Spill The Milk Series notes parents should make sure the sleep sack’s zipper is a high quality “so that it doesn’t come undone in the night” and pose a suffocation risk

Design

There are several different sleep sack designs to choose from based on your child’s age, size, and mobility. Keep your child’s abilities in mind when choosing between a swaddle sleep sack, transitional sleep sack, standard sleep sack, or early walker sleep sack. Also, the older your child gets the more options you have in terms of longevity, which is definitely something to consider when shopping. 

Materials

You don’t want to purchase a microfleece sleep sack in the middle of the summer, and you may want to avoid a sleep sack that isn’t safe for the washer or dryer if you're not up for handwashing, so look closely at how the product is made before purchasing. Dr. DeBear also suggests considering the climate where you live and the temperature you generally keep your home at to help you decide which material is best for your child. 

FAQs

Are sleep sacks safe?

Sleepsacks, or wearable blankets, are safe for babies and are a great way to keep a baby warm as long as they are appropriately sized. Sleep consultant Aubrie DeBear, Psy.D., tells Verywell Family that parents should “ensure your child is wearing the correct size and that the sack is not too small or large, which can lead to rising up to cover the face, or inhibiting full movement.” To do this, she says parents should “check the age and weight specifications of the sleep sack to make sure it's the right fit for your child.”

In order to create a safe sleeping environment and reduce the risk of SIDS, parents should follow the Safe Sleep Guidelines from the American Academy of Pediatrics (AAP). Babies should sleep in their own crib with a firm mattress free of soft objects and loose bedding like blankets, pillows, toys, or anything else that could cause suffocation. Additionally, it is important to note that the AAP strictly advises against the use of weighted sleep sacks or blankets for babies. 

When do babies start wearing sleep sacks?

Appropriately sized sleep sacks are safe for a baby to use as soon as they’re born. However, because of the startle reflex, many newborns like to be (and sleep better) swaddled, so you will likely want to consider a swaddle sleepsack that has flaps with velcro which can be wrapped around the baby’s arms.

If your baby starts to break out of the swaddle, or obviously wants their arms free, many of these sleep sacks allow you to wrap the flaps around their torso so their arms are free but they’re still getting the feeling of light compression to help soothe them. 

What is the difference between a sleep sack and a swaddle?

A swaddle is a large piece of cloth cut in the shape of a square that is folded and wrapped snugly around a newborn (kind of like a burrito) to soothe their startle reflex. A sleepsack is a loose-fitting wearable blanket that goes over the baby’s shoulders, keeping their arms free, and zips up to cover the feet and to ensure the blanket stays in place so that it does not pose a suffocation risk.

Some sleepsacks are designed to also serve as swaddles and/or as transitional blankets as the baby moves from a snug swaddle to a roomier sleep sack.

Why Trust Verywell Family?

Ashley Ziegler is a full-time parenting writer and mom to a 2-year-old and a 4-year-old. She has personal experience in researching and purchasing a variety of children’s products, including sleepsacks. Key considerations she used when selecting these recommendations include expert advice, age appropriateness, and user reviews.

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Verywell Family uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. American Academy of Pediatrics. Safe Sleep: Recommendations.