Warm Sleep Sacks For Baby

How We Chose Our Best Sleep Sacks for Winter · Kyte Baby 2.5 TOG Bamboo Sleep Bag · Halo SleepSack Wearable Blanket (Micro-Fleece)

The Kyte Baby 2.5 Tog Bamboo Sleep Bag might seem pricey at first look, but it’s durable, versatile, and keeps your baby warm without the use of chemicals. The Halo SleepSack Wearable Blanket (Micro-Fleece) is available in a variety of sizes and colors, making it easy to get the right fit for your child.

The best sleep sacks for winter are made for babies who need extra warmth. This sleep bag is designed with a double-layer of cotton flannel to keep your baby warm and cozy all night long. The zipper allows you to take off the extra layer if necessary.

Sleep sacks are a great way to keep your baby warm and cozy at night, during the winter months. Babies may be able to start sleeping without swaddling at 3 months old, but many times, they still need extra warmth for their body. With all of the different sleep sack options available, it can be hard to pick the right one; here’s a list of our favorite brands and styles.

They keep your little ones warm and cozy, but you want the best sleep sacks for babies. However, not all of them are created equal. That’s why we’ve chosen the top five rated ones that are weatherproof, super soft and contain unique features that make it easy to get your babe in and out of them.

The best sleep sacks for baby keep your little one warm, but not too hot. These sleep sacks have been tested in a variety of different styles to ensure that they are safe and comfortable. Most will be able to be used for babies up through toddlerhood and are often designed with a zipper or buttons so that you can easily wash the sleeper.

Best Sleep Sacks for Babies

Just like Goldilocks, trying to keep your baby’s temperature just right while they sleep—not too hot and not too cold—can be a bit of a head-scratcher, especially if you live in a place where winter packs a punch. And since loose blankets in the crib are a definite no-go, you’ll need something not only warm but safe as well.

Enter sleep sacks designed specifically for cooler sleeping temperatures: your new winter BFF. We’re taking you through what to look for, how to dress your baby for sleep when it’s chilly outside and the best sleep sacks for winter.

What Is a Sleep Sack?

A sleep sack is like a mini sleeping bag for your baby or toddler. Also called a wearable blanket, a sleep sack helps to keep your baby warm in their crib without using loose blankets. Most sleep sacks feature zippers or snaps for easy on/off and quick diaper changes.

Why use a sleep sack? Because your baby will likely get chilly overnight, especially if you live in a cooler climate, but putting things like blankets or quilts in the crib isn’t safe. (Check the American Academy of Pediatrics safe sleep guidelines for a full breakdown of the do’s and don’ts of safe baby sleep.)

Sleep sacks are the perfect answer to keeping your baby warm and safe throughout the night.

How Should a Sleep Sack Fit?

Be sure the sleep sack you choose is sized correctly for your baby. Test out the collar and pull it up to be sure it doesn’t cover your baby’s nose or mouth while they are laying on their back. Be sure the arm and neck openings aren’t too big. (Extra material below baby’s feet is fine.) And be sure there’s enough space in the hip area for them to move their hips comfortably to ensure proper hip development.

How Should I Dress Baby for Sleep?

The key to dressing a baby for sleep is to avoid any extremes—you never want your baby to be too hot or too cold. An easy way to tell is to touch their ears or their neck. If their ears are red or hot and their neck is sweaty, your baby is likely too warm. If they’re feeling cold, it’s probably time to add a layer.

Since sleep sacks designed for cooler temperatures are thick and warm, you usually only need one layer underneath, like a long-sleeve footie.

What Is TOG?

TOG is a term you’ll see mentioned in many sleep sack descriptions, especially those designed for cooler temps. It stands for Thermal Overall Grade, which indicates how much heat the 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 sleep sack brands have TOG rating charts to help you figure out which one is right for your baby’s sleeping environment.

What Is the Best Cold Weather Sleep Sack?

When choosing the best winter sleep sack for your baby, keep these things in mind:

  • Nursery temperature. How cool does your baby’s sleeping space get overnight? (The recommended temperature is between 68 to 72 degrees Fahrenheit or 20 to 22 degrees Celsius.) The cooler your nursery, the higher TOG sleep sack you’ll need.
  • Your baby’s temp. Does your baby tend to run hot or cool? Your little one’s internal heater will also affect choosing the best winter sleep sack for them.
  • Budget. Winter sleep sacks can get pricey. If you want to be able to use yours for as long as possible, invest in one that works from the early months through toddlerhood.

How We Chose Our Best Sleep Sacks for Winter

We asked thousands of real Babylist families about the baby products they love the most, then took the top products they shared with us and added our own research and insight to tell you about the best sleep sacks for winter.

Softest Sleep Sack for Winter

Kyte Baby 2.5 TOG Bamboo Sleep Bag - $55.99.

Kyte Baby 2.5 TOG Bamboo Sleep Bag

$55.99

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What Our Experts Say

If softness is what you’re looking for in a sleep sack, look no further, because Kyte Baby is where it’s at. This sleep bag is made from bamboo fabric and is about as comfy as they come. It has a double zipper for easy diaper changes and comes in a range of beautiful, on-trend colors.

What’s Worth Considering

This sleep bag is machine washable but you’ll have to skip the dryer and hang it up instead.

Best Affordable Winter Sleep Sack

Halo SleepSack Wearable Blanket (Micro-Fleece) - $29.99.

Halo SleepSack Wearable Blanket (Micro-Fleece)

$29.99

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What Our Experts Say

Sleep sacks for winter run on the pricier side, but not this one from Halo. It’s made from soft, warm microfleece and costs about half of many of the other options on our best-of list. It holds up well in the wash (and the dryer) and is available in lots of different sizes and colors.

What’s Worth Considering

This sleep sack has an inverted zipper, which we think isn’t as easy as the double zipper option. It’s also one of the lighter-weight winter sleep sacks on our list at a 1.0 TOG, so it’s not ideal for chillier sleeping spaces.

Best Winter Sleep Sack for Cold Temperatures

ergoPouch Jersey Sleeping Bag 2.5 TOG - $64.99.

ergoPouch Jersey Sleeping Bag 2.5 TOG

$64.99

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What Our Experts Say

An all-time favorite of a few Babylist team member parents, this jersey sleeping bag features everything there is to love about a winter sleep sack. It’s ultra-warm (2.5 TOG, to be exact), super soft and is made from 95% organic cotton with a hint of stretch. It’s also on the slimmer side, making it a good first sleep sack to transition to right after the swaddle. Babylist users also rave about how well it holds up wash after wash.

What’s Worth Considering

Also worth checking out: ergoPouch’s Sleep Suit Bags. They convert from a sleeping bag to a sleep suit and are ideal for walking toddlers and preschoolers. The 2.5 TOG and 3.5 TOG options are the best choices for winter wear.

Best Winter Sleep Sack with Style

Loulou Lollipop Sleep Bag 2.5 TOG (Tencel).

Loulou Lollipop Sleep Bag 2.5 TOG (Tencel)

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What Our Experts Say

A pop of color is just what you need to brighten up a cold winter day. These sleep bags from Loulou Lollipop are just as stylish as they are functional. We love the fun patterns and trendy colorways, but we also love how warm and soft they are.

What’s Worth Considering

These sleep sacks are also air dry only, so factor that into your laundry time.

Best All-Season Sleep Sack

Woolino 4 Season Ultimate Baby Sleep Bag - $99.99.

Woolino 4 Season Ultimate Baby Sleep Bag

$99.99

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What Our Experts Say

If you’re the outdoorsy type, you likely already know how well wool keeps you cool and dry when it’s warm and nice and cozy when it’s not. The same idea holds true for this all-seasons sleep sack. It’s made from breathable Merino wool and naturally regulates your baby’s temperature in any environment. (The outer layer is made from organic cotton so it’s not itchy at all.) We also love that it’s not thick or bulky and that it features shoulder snaps and a two-way side zipper for easy dressing.

What’s Worth Considering

This sleep bag doesn’t come cheap. However, since it will last you from two months through about two years old and can be used all year, you’re getting your money’s worth.

Best Swaddle Transition Winter Sleep Sack

Love to Dream Swaddle UP Transition Bag Warm 2.5 TOG - $59.95.

Love to Dream Swaddle UP Transition Bag Warm 2.5 TOG

$59.95

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What Our Experts Say

Making the switch from a snug, secure swaddle to the freedoms of an unrestrictive sleep sack can be tricky for some babies. If you’re making that change during the winter months, this is our favorite transitional sleep sack to get the job done. It’s a 2.5 TOG, so it’s nice and warm, and it features zip-off wings so you can easily let those arms free when your little one is ready.

What’s Worth Considering

The zippers on the wings can be a little tricky to get on and off, but since you’re not doing it on the regular, it’s not a very big deal.

Best Winter Sleep Sack for Infants Through Toddlers

MORI Clever Sleeping Bag 2.5 TOG - $89.50.

MORI Clever Sleeping Bag 2.5 TOG

$89.50

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What Our Experts Say

This sleep sack goes the distance. Usable from about eight pounds all the way through to two years old, it’s the only one you’ll need from the newborn days through the toddler years. The material is a mix of viscose, bamboo and organic cotton so it’s supremely soft. There’s even a belt loop for straps if you want to use it in your stroller.

What’s Worth Considering

The lower portion of this sleep sack is quite wide and very long. (Which is great for an older baby but a bit overwhelming if you’re using it on a younger one.) We recommend using the bottom snaps to fold up the fabric and adjust the length to make it more suitable for a smaller, younger baby.

Most Comfortable Sleep Sack for Winter

GUNAMUNA Baby Sleep Bag - $57.99+.

GUNAMUNA Baby Sleep Bag

$57.99+

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What Our Experts Say

This duvet-style sleep sack is perfectly pint-sized and ideal for chilly nights. The down-like material is fluffy, soft and warm and feels just like your own favorite duvet, just made safe for little ones. There are top snaps plus a zipper for easy on and off.

What’s Worth Considering

Need even more warmth? There’s also an option with sleeves.

Best Winter Sleep Sack That’s Easy to Put On

baby deedee Sleep Nest Sleeping Sack, 2.5 TOG - $35.44.

baby deedee Sleep Nest Sleeping Sack, 2.5 TOG

$35.44

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What Our Experts Say

Getting a squirmy, wriggly baby into a sleep sack can prove quite the challenge, especially as toddlerhood looms. This sleep sack has a patented shoulder strap design that makes getting your little one in (and out) fast and painless. The quilted material is warm and cozy, and the price is much more affordable than many other higher TOG sleep bags.

What’s Worth Considering

One more differentiator here: the zipper. It’s sturdy and thick, so it’s more durable and takes less effort to zip up and down when compared to many other sleep sacks. (It’s not too bulky though, don’t worry.)

How Long do Babies use Sleep Sacks

Swaddling is an age-old technique for wrapping babies in a blanket in order to replicate the feeling of being in the womb. When done correctly, the American Academy of Pediatrics (AAP) says that swaddling can help calm infants and promote sleep.

While our ancestors may have wrapped their little ones in thin cloth, today’s marketplace is filled with products that do much of the swaddling work for you. 

The sleep company Halo was the first U.S. company to popularize “sleep sacks” when it debuted a product in the early 2000s intended to help babies snooze and also reduce the risk of getting tangled up in clothing or loose bedding during the night. (The product was inspired by European sleeping bags for babies, which have been used for decades.) Today, the term has become synonymous with wearable blankets.

The idea of a sleep sack is the same as swaddling: to provide security, comfort and a snug feeling for little ones to help them rest easy on their own. “Babies like to feel comfort and security while they’re sleeping,” says Miami-based pediatrician Gary Kramer, MD. “Since traditional blankets are deemed unsafe for children under 1, swaddling or sleep sacks are a great alternative.”

Some sleep sack products are marketed toward preventing Sudden Infant Death Syndrome (SIDS) because they help mitigate some of the risk factors associated with SIDS, such as overheating and blanket tangling. While the AAP says wearable blankets are preferable to traditional blankets for keeping baby cozy at night, it’s still critical for parents to practice safe sleep hygiene with their babies. Always have baby sleep on her back and never put anything in her crib (even pillows) until she’s at least 12 months old. And no matter which sleep sack you buy, make sure to follow the manufacturer’s sizing recommendations and usage instructions, as incorrect usage has been associated with injuries.

Choosing the best sleep sack for you

There are now dozens of brands that make wearable blankets, using lots of different styles, fabrics and designs. But there are a few main categories of sleep sacks to choose from: 

  • Sleeveless sleep sacks: These are designed for baby to have her arms out while sleeping, while keeping the rest of her body contained in a closed sack. They usually have a zipper to help you get baby in and out; the best ones use an inverted zipper for easier diaper changes. This style can typically be used safely for babies long after they’re able to roll over because her arms are free. 
  • Swaddle-style sleep sacks: These wearable blankets combine the best of a sleep bag with the best of a swaddle. Your baby is enclosed in a cozy bag, and then extra fabric flaps are secured around her arms to swaddle her. (Some models mimic swaddling by giving baby covered sleeves to hold her arms instead.) Like a traditional swaddle, these are not safe to be used once baby can roll herself over — usually around 4 months — unless the design of the bag can convert to keep her arms free. 
  • Weighted sleep sacks: Some sleep sacks, suits, swaddles and blankets offer additional weight, but the AAP says these are not safe and therefore shouldn’t be used. 

To help you choose between all the different types of sleep sacks, here are some other things to consider as you’re buying:

  • How long baby can use it for: Make sure to look at the product’s age range. Some sleep sacks, including those that pin baby’s arms down, are only intended for use until baby can roll over and must be phased out by 4 months at the latest, Dr. Kramer notes. Other sleep sacks are versatile enough to grow with baby (allowing for her arms to be out, for example).
  • Material: Sleep sacks are available in a slew of different styles and materials, so make sure you choose one that’s best for the season you’re in. Avoid synthetic materials like fleece or polyester, which can trap heat and potentially cause overheating, Dr. Kramer says. And again, stay away from anything weighted.
  • Size: Again, some wearable blankets can adjust to your growing baby’s needs, while others come in a set size. You want to make sure the sleep sack fits baby comfortably so that she’s not too squished inside of the blanket , but not so loose that your baby could potentially kick it off or be smothered, says Dr. Kramer.
  • Design: Trial and error definitely come into play here to find what works best for you and your child. But many parents prefer sacks with zippers to buttons and snaps because they can be opened more easily. 

How we made our picks for the best sleep sacks

We stuck with sleep sacks that met our experts’ recommendations for both safety and comfort. We also factored in the experiences of the What to Expect community members and our own editors to find products with a track record for being easy to use and truly helpful at ensuring a better night’s sleep for babies and toddlers.

Below, the best sleep sacks for different stages and sleep environments — all of which will keep your little one cozy and secure.

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