Best Sleep Sacks, According to Parents Who've Used Theirs for Years

Once baby can roll over, Halo’s SleepSack is a great pick. It has an inverted zipper for easier diaper changes, and the sleeveless design will keep baby from overheating. It's a What to Expect Mom Must-Have Award winner for a reason.  

Keep in mind that the brand offers a variety of different types of wearable blankets, but this style is "arms out," meaning it's best for little ones who can roll over and don't need their arms pinned down the way a traditional swaddle blanket does. This style is available in sizes small (for babies up to 18 lbs. or 26 inches long) to extra large (for toddlers up to 36 lbs. and 40 inches long). You can also find it in fleece for extra warmth on cool nights. Parents love how soft and lightweight it is, although some report that the zipper breaks easily and has to constantly be rethreaded.

Sizes: S through XL 

Age range: 0 through 24 months

This transitional item is ideal for the first few months of your child's life, though it also has uses beyond that. 

Your little one can wear this product in three different ways, depending on her age and whether or not she's demonstrated the ability to roll over: both arms in (for the youngest babies, to mimic a swaddle blanket), hands to face (another swaddling-style technique) or one or both arms out (if your baby is able to roll over, usually about 4 months) before switching to a sleep sack for good. Parents say the fasteners makes swaddling way easier than traditional blanket-folding techniques, and they love how versatile the sack is. It’s available in cotton, cotton muslin, microfleece and the company’s “Ideal Temp” fabric, which claims to help better regulate baby’s temperature to avoid overheating.

One more smart feature to appreciate: the inverted zipper opening at the bottom, which allows for quick nighttime diaper changes without needing to take the entire swaddle off.

Sizes: Preemie, newborn and small

Age range: 0 to 6 months

Graduating out of a swaddle and into an arms-out wearable blanket (usually around 3 or 4 months, depending on when baby rolls over) can be a challenge for little ones. The Sleeping Baby Zipadee-Zip Sleep Sack is designed to help ease your baby through this transition. This product has a unique starfish design, à la Maggie Simpson’s snowsuit,  allowing your baby to safely roll over and wiggle around while still enclosing her in a secure swaddle. It also has a huge range of cute designs and fabrics to choose from. Some parents also recommend getting the brand’s Snuggle Strap, which mimics the feeling of swaddling without constricting baby’s arms. 

Sizes: XS through XL 

Age range: 3 months to 3 years

Did you know that many babies like to sleep with their arms up when they’re lying on their backs — a self-soothing mechanism that can help them feel more comfortable if they wake themselves up in the middle of the night? Unlike some other wearable blankets, Swaddle Up is a sleep sack-swaddle hybrid designed to allow for this sleep position. Plus, the sack doesn’t have (sometimes noisy) Velcro, making it a good fit for fussy or light sleepers.

Note that this product should not be used once baby shows signs of rolling over. At that stage, you should transition to an arms-out wearable blanket.

Sizes: Newborn, small and medium 

Age range: Newborn through 6 months (or until baby starts to roll over on her own)

You can always count on Burt’s Bees to deliver: This arms-out sleep sack is 100 percent organic cotton and super soft and breathable, making it ideal for warmer weather. It also comes with plenty of legroom, as well as a bottom zipper to make diaper changes a breeze. You can choose from three different sizes and a variety of cute prints, but let’s be real — it’s hard to resist the sweet little bee pattern!

Also nice? Many members in the WTE community agree that the price is a better value compared to most other sleep sacks. So you can stock up on a few and always have a clean one handy.

Sizes: Small, medium and large

Age range: Newborn through 24 months

If you want to sleep in this cozy number after looking at it, you’re not alone. This arms-out sleep sack is made of cotton as well as a warm quilted material that makes it a perfect fit for chilly nights. So there’s virtually no debate over whether your little one will sleep comfortably. There’s plenty for you to love too: Shoulder snaps make it easier to slide your little one into the sack. 

Size: Small, medium and large

Age range: Newborn up to 36 months

A bestseller at a more budget-friendly price? It's no wonder parents gravitate toward this arms-out sleep sack from Carter's. The ankle-to-neck zipper will make your job even easier, and who can resist the whimsical patterns? Even better: You'll get a set of three sleep sacks for less than what many competitors charge for just one. But the affordability doesn’t mean you’ll miss out on quality. 

Sizes: 0-3 months, 3-6 months, 6-9 months

Age range: Newborn through 9 months

Whether you fall in love with the sweet designs of these sleep sacks or the three soft layers of knit fabric they’re made from, we won’t blame you for splurging. Providing just the right amount of warmth, these beautiful arms-out sacks put baby’s comfort first. The neck is also tag-free — a nice touch to prevent any irritation. 

Will the fabric meet your standards? Only you can say for sure. But if you opt to buy this sleep bag, be sure to follow the washing instructions exactly (machine wash cold, then tumble-dry on low) for the best chances that it stays as nice as it was when you first bought it. Parents also wish it came in larger sizes so they could continue using it as their little ones grow.

Sizes: 0-6 months, 6-12 months

Age range: Newborn to one year

You’ll be hard-pressed to find prettier patterns than those on Aden + Anais baby products. The 100 percent cotton muslin fabric is ultra-soft and lightweight too, helping your cutie sleep cool on warm nights. And even though it’s delicate, parents report that it holds up well in the wash. It also comes in a larger size range, so if you love it when your baby’s 2 months old, you can stick with the brand as she grows.

Sizes: 0-6 months, 6-12 months, 12-18 months and 18-36 months
Age range: Newborn through 18 months