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5 Organic Baby Sleep Sacks: Wearable, Cotton, Warm

Organic Baby Sleep Sacks

A baby sleep sack is the perfect sleeping essential that will give your bundle of joy the best sleep possible. 

As a mommy of two babies, seeing them look so snug and cozy in their sleep sacks makes me want to get one for myself!

These great baby products are LIFESAVERS when putting your little ones to sleep. Going for organic options makes them even better because you don’t have to worry about toxic chemicals harming your precious baby!

In this list, we picked the best organic baby sleep sacks you can find in the market today.

Wool Option
Our Pick
Muslin Option
Woolino 4 Season Sleep Bag
Burt’s Bees Baby Wearable Blanket
Aden + Anais Muslin Sleeping Bag
Our Pick
Burt’s Bees Baby Wearable Blanket
Wool Option
Woolino 4 Season Sleep Bag
Muslin Option
Aden + Anais Muslin Sleeping Bag
Table of Contents
Table of Contents

5 Best Organic Sleep Sacks for Infants

1. Burt’s Bees Baby Wearable Blanket


Baby Sleep Sacks Our Pick

There are a lot of things we love about this GOTS certified organic cotton sleep sack, and with a ton of positive reviews on Amazon, thousands of parents love it too! 

This best-selling wearable blanket is our pick for the best sleep sack because of its great designs, comfort, breathability, and certifications!

We highly recommend this if you’re looking for a good quality wearable blanket.

This product is made of GOTS-certified organic cotton, so it’s free from any toxic chemicals that can harm your baby.

It’s also certified by Amazon for being “Climate Pledge Friendly” which means it’s manufactured and packaged sustainably!

It also has a zipper closure that starts from the bottom, giving you access to easy diaper changes, so that’s a plus!

This sleep sack is hard not to love, and for the moms reading this, you’ll get your best sleep knowing that your baby is also getting their best sleep from this certified organic option!


  • GOTS-certified organic cotton is great for baby’s sensitive skin
  • High-quality finish
  • Variety of designs
  • Affordable
  • Machine washable


  • Limited size options might not work for all

2. Woolino 4 Season Baby Sleep Bag


Best Wool Option

This sleep sack is made of high-quality, hypoallergenic Australian merino wool on the inside, and 100% GOTS-certified organic cotton on the outside. 

It’s luxuriously soft and can regulate your baby’s body temperature really well! It’s called a 4 season baby sleep bag for a reason!

What makes the Woolino sleep bag great is its one-size-fits-all design. You can adjust the double shoulder snaps for the best fit so it grows alongside your baby. 

It also has a two-way zipper on the side making clothes or diaper changes easier for you.

You have 12 wonderful designs to choose from, but whatever design you go for, you won’t be disappointed with this high-quality sleep sack!


  • High-quality materials work great for all situations
  • One size works for ages 2 months to 2 years
  • Variety of designs
  • Wool is naturally fire-resistant
  • Machine washable


  • Expensive

3. Aden + Anais Classic Muslin Sleeping Bag


Baby Sleep SacksBest Muslin Option

Muslin is a great organic cotton fabric that’s lightweight, breathable, and perfect for the summer. When it comes to muslin products, Aden + Anais is a top player. 

Their classic muslin sleeping bag is a great product that any mom should have in her inventory. This 100% organic muslin sleep sack will keep your baby cool and comfy!

This product features a bottom-to-top zipper design for easy diaper changes. Since it’s made out of organic cotton, it’ll also get softer the more you wash it, so that’s great! 

What makes this sleep sack stand out is the different sizes and designs you can choose from. You won’t have any problem finding the best one for your bundle of joy!


  • Organic cotton fabric is great for breathability
  • Affordable
  • Variety of sizes and designs
  • Lovely packaging makes it a great gift option


  • Some mothers found the zipper easily breakable

4. Merino Kids Baby Sleep Bag

Merino Kids Baby Sleep Bag

This wool baby sleeping bag is similar to Woolino, and it’s another great option you can consider. 

Ethically sourced from Australia and New Zealand, this merino wool is high-quality, itch-free, allergy-free, and regulates body temperature too!

You can use this sleep sack all year round and it’ll work great for any situation to keep your baby comfortable.

Being 100% GOTS certified, you don’t have to worry about any toxic chemicals harming your baby. 

Merino Kids claims that this is the first sleep bag in the world to pass the strict standards of BSI UK for baby sleep bag safety, so that’s great!

This is pricier compared to Woolino’s and has fewer design choices, but it’s still one of the best wool sleep sacks that you can find in the market today. This product will not disappoint!


  • High-quality wool fabric
  • One size works for ages 0-2 years
  • Two safety certifications


  • Expensive
  • Limited design choices

5. Halo Sleepsack Wearable Blanket Organic

Halo Organic

Halo is a great brand that’s popular for their organic swaddle blanket, but they also have an organic sleep sack that’s just as great. 

This sleep sack is made out of 100%, super soft organic cotton and does a great job of keeping your baby warm without sacrificing breathability!

The Halo Sleepsack has organic cotton fabric has a double-knit construction making it soft, stretchy, and feel wonderful on your baby’s skin. 

It’s also recognized by the International Hip Dysplasia Institute for being hip-healthy! On top of that, hospital nurseries also promote this product as a great “safe sleep” option.

Another great feature is that it has a two-way zipper design, making diaper changes easier for you. This product checks all boxes for a great and reliable product!


  • Finish of the fabric feels great on the skin
  • Recognized by IHDI and hospital nurseries
  • Non-toxic
  • Affordable


  • Limited size options might not work for you

What Is a Sleep Sack?

What is a Sleep Sack

A sleep sack is a one-piece wearable blanket that works similarly to a swaddle. The main difference is that the design gives more freedom because your baby’s arms won’t be secured.

Sleep sacks are meant to replace loose blankets for your baby. Loose items can be sleeping hazards for newborns, so sleep sacks are the PERFECT solution. 

Your baby will be cozy and warm, and you don’t have to worry about the dangers that a loose blanket can give.

Are Baby Sleep Sacks Safe? — Factors to Consider

For any baby product, the first thing parents should ask is if they’re safe for their little one.

When it comes to sleep sacks and wearable blankets, there are a couple of things you should keep in mind before buying one.

1. Organic Material

Organic is always best when it comes to the safety of your baby!

Organic sleep sacks don’t have harmful chemicals that conventional sleep sacks might have. 

Some of the harmful chemicals you should look out for are dyes, flame retardants, bleach, and insecticides.

There are hundreds of other toxic substances you should be aware of, but keeping track of all of them can be a hassle. 

Luckily for us, baby sleep sacks and wearable blankets can be certified to be free from any of these toxic chemicals!

GOTS Certification

The Global Organic Textile Standard (GOTS) is a manufacturing certificate that makes safety standards for products. 

When you see products with this certification, that means they went through rigorous testing protocols to meet all environmental, toxicological, and safety standards. GOTS-certified products are 100% safe for your baby!

Not all organic products have a GOTS certification, but that doesn’t necessarily mean they’re unsafe. 

If you’re interested in buying baby sleeping bags that aren’t GOTS certified, just make sure to check if you’re buying from a reliable brand that’s been tried and tested by a lot of parents! 

Although as much as possible, going for a GOTS certified organic sleep sack would be best.

2. Features


Sleeping sacks are great baby products that help keep your little one warm and ready to sleep. 

Some of the features you should look for in wearable blankets are sturdy zippers, fabric breathability, and mobility.

#1 Zippers

For zippers, make sure they have guards and are covered up by the fabric when you zip them. It also helps if the zipper is two-way or starts from the bottom instead of the top. 

These zippers will give you quick access to change diapers easily. They could also help you put on the sleep sack easier on a sleeping baby without waking them up.

All of the wearable blankets on this list either have two-way or bottom-to-top zippers, so that’s a feature you can already check off.

#2 Breathability

Since babies can’t regulate their body temperatures well like adults, they’ll have a harder time adjusting to the environment. It’s important to choose the right fabric for their wearable blanket!

For hotter temperatures, the best sleep sack would be a muslin cotton sleeping sack. Muslin is organic cotton that has an open-weave design. This makes it very breathable, lightweight, and allows a lot of airflow. This is the perfect choice for hotter climates.

For colder environments, great sleep sack material options would be regular organic cotton or wool sleep sacks. Since these don’t have an open-weave design like muslin, they can protect your baby better from the cold and would keep your baby warm.

Although, they still provide enough breathability to avoid overheating, so that’s great!

Whatever fabric you go for, always keep in mind what your baby is wearing underneath. 

If you’re making your baby wear onesies or thick pajamas, then a muslin sleep sack will be enough.

Although, if they’re only in their diapers or only have a shirt on, sleep bags with regular cotton or wool fabric will probably be best.

#3 Mobility

By mobility, we mean how much room the sleep sack can give for your baby’s arms and legs. 

Some sleep sacks come with built-in sleeves, but all of the best organic sleep sacks we listed down are sleeveless. This makes it work well for whatever your baby is wearing underneath. 

It also gives more freedom for your baby’s arms which is great!

For the legs, a baby sleep sack with a lot of legroom is a must. Tight leg spaces will force your baby’s legs to stretch and straighten out. This will interfere with proper hip development and can cause hip dysplasia for your baby.

When picking a sleep sack for your little one, make sure that you pick the right size. A sleep sack that’s too small can lead to hip problems, while a sleep sack that’s too large might not feel cozy for your baby.

3. Health and Safety

Sleep sacks are generally safe for your baby, so you don’t have to worry much. Although, you should keep in mind that sleep sacks aren’t best for newborns. 

Newborns have a startle reflex that can disrupt their sleep, so swaddles aim to secure their arms inside and avoid this from happening.

Sleepsacks, on the other hand, are better for older and bigger babies who can’t stand the tightness of swaddles. 

You also don’t have to worry about the startle reflex because they would already outgrow it when they’re 3-6 months old!

Sudden Infant Death Syndrome

Sleep sacks are also essential replacements for loose blankets to keep your baby warm when they sleep. 

Loose items around your baby’s bassinet or crib are linked to Sudden Infant Death Syndrome (SIDS).

Even though this is a rare occurrence, you want to reduce the chances of it happening as much as you can. 

SIDS often occurs when your baby sleeps, so having the safest sleeping environment is a top priority!

These cute sack sleepers do more than just keep your bundle of joy comfy and warm!

When Should Babies Stop Wearing a Sleep Sack?

When to Stop Using A Sleep Sack

What’s great about sleep sacks is that, as long as they still fit, you can use them for your baby as long as you want!

Observe how your baby reacts to the sleep sack and see if they’re still comfortable in them. 

If at some point they already get squirmy and feel restricted with the largest size possible, then it’s time to move on from it.


Overall, the Burt’s Bees Baby Wearable Blanket is our pick for the best organic sleep sack, and we’re sure that thousands of other parents would agree with us! From manufacturing until the end-product, this product does everything well, and it’s affordable too!

We also strongly recommend the Woolino 4 Season Baby Sleep Bag because of its versatility and luxurious feel. It’s a cheaper wool option than Merino, but still delivers top-notch quality that’s great all year long!

The Aden + Anais Classic Muslin Sleeping Bag is a classic that we also highly recommend. A great muslin wearable blanket is the perfect summertime baby sleepwear essential. All parents should have at least one of these ready to use when the time comes!


November 21, 2022 – added 1 new article link

September 4, 2022 – minor content edits

October 12, 2021 – reviewed and updated article formatting and content

August 3, 2021 – updated 3 article links

July 22, 2021 – reviewed and updated article links

About the author

Angelica Graham

A few years ago, Angelica found out about all the plastic and toxic ingredients that got into most children’s products. And this worried her to no end. Because of this, she began to research what the best ingredients and materials were for children and made it her mission to share this information with other mothers.