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These wearable blankets feel cozy and keep the crib bare.

Parents want their babies to be comfortable while they sleep, but first and foremost, the baby's sleeping environment needs to be safe. The American Academy of Pediatrics says to keep cribs bare of any loose objects (including blankets), but you can opt for baby sleeping bags (a.k.a. sleep sacks) to give your baby that cozy feeling without the risk.

A sleep sack is a wearable blanket that babies can use instead of a real blanket. It usually zips on over clothes to give baby the warm and cozy feeling of a blanket without having to worry about the risk of suffocation. That makes sleep sacks a good transition from swaddles and stay put on older babies that toss and turn.

The Good Housekeeping Institute scientists and parenting experts evaluate baby gear of all kinds, including sleep products like cribs, crib mattresses, and more. The sleep sack picks ahead are from brands we trust with rave reviews from our experts and real users. But first, here's what you need to know about baby sleep sacks:

Yes! Because sleep sacks fit more like clothing than a blanket, you don't have to worry about it posing a risk as long as it's properly worn. The sleep sack should never be loose enough that the material could cover baby's face. It's also safer than a swaddle blanket as baby gets older and rolls around because it doesn't restrict movement in the crib.

Most of the time a long- or short-sleeved onesie is perfect for wearing under a sleep sack, but it depends on the temperature of the room and what type of sleep sack you're using. If it's a lightweight fabric, you can consider putting baby in pajamas underneath. If the sleep sack has long sleeves or added insulation, a thinner bodysuit should be enough.

This super-popular brand coined the term "SleepSack" and is a favorite amongst real parents. The zipper sits at the bottom instead of the top so you don't have to worry about it scratching baby's face and it makes overnight diaper changes much easier.

This style in particular is a cotton knit fabric that feels super soft and gives warmth without trapping in too much heat. The brand also has a microfleece version for colder weather and a breathable muslin variation for warmer temperatures.

• Fabric: 100% cotton  • Sizing: Available in small through extra-large for zero through 24 months (up to 36 pounds)

If you know you'll be buying multiple sleep sacks, this set of three is an Amazon exclusive and a total steal at just $9 each. Not to mention, it has hundreds of rave reviews from real users. It uses a cotton fabric and the zipper has a tab to keep it covered. 

• Fabric: 100% cotton • Sizing: Available in small or medium for zero through nine months (up to 21 pounds)

This unique sleeping bag has a lightly-weighted pad on the chest that mimics the feel of your hand to give baby a little extra comfort during the night. The fill is similar to what you find inside stuffed animals and sits inside a cotton fabric. It also has a two-way zipper along the side and adjustable shoulder straps that makes it take longer to outgrow.

• Fabric: 100% cotton with poly beads • Sizing: Available in 0-6 months, 6-15 months, and 15-24 months (up to 36 pounds)

Most wearable blankets are sleeveless, but this microfleece style has long sleeves for extra warmth on chilly nights.  The fabric feels soft and cozy, but it's not too heavy for those worried about overheating. This one also has a tab to cover the zipper at the top.

• Fabric: 100% polyester • Sizing: Available in small or medium for zero through nine months (up to 21 pounds)

This sleep sack is made with GOTS certified organic cotton so you know the entire manufacturing process (not just the growing of the cotton) follows strict standards. It's also soft thanks to a special production process that removes short fibers and only leaves the long, smooth ones. It zips from the bottom and still has a tab cover to prevent baby from trying to open it.

• Fabric: 100% organic cotton • Sizing: Available in small through large for zero through 18 months (up to 28 pounds)

This one's pricey, but it's made of organic cotton and merino wool, a soft and temperature-regulating fiber that can be used all year long. And because it's only available in one adjustable size, you won't need to keep buying a new one as your baby grows. There's a two way zipper on the side and the soulder straps are adjustable.

• Fabric: 100% organic cotton with a merino wool fill • Sizing: One size for two months through two years (up to 32 pounds)

This super plush fabric feels like a cozy throw blanket. In fact, it's so soft you'll wish they made it in your size! The zipper sits at the bottom and it has a snap-button tab at the top. This one is sized for younger infants and comes in a gift box, so it would make a perfect baby shower gift.

• Fabric: 100% polyester • Sizing: One size for zero through six months

Aden + Anais is best known for its cotton muslin blankets and offers the same fabric in this wearable version. The muslin fabric is breathable so it helps prevent overheating, especially if you want baby to wear PJs underneath. Like some others, this style unzips up from the bottom for easy nighttime diaper changes.

• Fabric: 100% cotton • Sizing: Available in small through extra-large for zero through 18+ months (up to 36 pounds)

This wearable blanket is built more like a comforter: it has an outer material that's made of a sateen sheet fabric and it's filled with cotton batting as the insulation. It zips from the bottom and the quilting design helps keep the fill evenly spread out. On top of that, the entire product is made of GOTS certified organic cotton.

• Fabric: 100% organic cotton • Sizing: Available in 0-6 months and 6-12 months

This one stands out for having detachable sleeves that you can add or remove depending on how cold the room is. The overall style is intended to keep baby warm and cozy in winter thanks to its batting inside for insulation. It has a reverse zipper opening with tabs to cover it on each end.

• Fabric: 100% cotton with polyester batting • Sizing: Available in 0-6 months and 6-18 months

If you're worried about the switch from a swaddle to a sleep sack, this one is designed to help you with the transition. It has a zipper just like a regular sleep sack, but it has a snug fit and the arms are still slightly restricted to help prevent baby's startle reflex. You can choose whether to leave baby's hands covered or open with the foldover mitten cuffs.

• Fabric: 100% cotton • Sizing: Available in small or medium for zero to six months (up to 21 pounds)

If you're still not ready to use a blanket when your baby becomes a toddler or you just want to make sure they'll stay warm without the covers falling off, a wearable blanket with leg holes is the perfect solution. It zips on just like a regular sleep sack and can go over PJs, but it gives your kid the freedom to walk around. This one's a microfleece fabric and goes up to size 5T, though it also comes in smaller sizes for early walkers. 

• Fabric: 100% polyester • Sizing: Available in 2T-3T or 4T-5T