You've just laid your baby down, tiptoed to the door, and there it is: that little voice in your head asking whether they'll be warm enough without a blanket. It's one of the first real dilemmas of new parenthood. You want your baby snug and cozy all night, but loose blankets don't belong in the crib.
That's exactly why we love baby sleeping bags (you'll also hear them called sleep sacks or wearable blankets). They zip on over pajamas, so your baby stays wrapped in a soft layer that can't be kicked off, bunched up or pulled over their face. And the one we keep coming back to is from aden + anais.
Our quick picks
- aden + anais Sleeping Bag: our favorite, in soft, breathable organic cotton muslin.
- HALO SleepSack 100% Cotton: the lighter, stretchy-knit choice for warm nurseries and hot summer nights.
aden + anais Sleeping Bag: a blanket they can't kick off
We loved the Classic Sleeping Bag in our original review. Shopping today, we'd choose the brand's organic cotton muslin Sleeping Bag for the same cozy, blanket-free bedtime: a wearable blanket that slips over your baby's pajamas and stays put all night.
The secret is the muslin. Aden + anais built its name on this airy, open-weave cotton, and the bag is made from two layers of lightweight organic cotton muslin with a 1.0 TOG rating. That's a light layer for a comfortably warm room, and the sleeveless cut lets extra heat escape. Better still, muslin gets softer with every trip through the washing machine, so the bag you pull out of the dryer in month six feels even nicer than the one you unwrapped.
The roomy sack gives little legs plenty of space to kick and wiggle, but those busy feet can't push it off. At 3 a.m. you'll appreciate the zipper, which opens from the bottom: unzip just enough for a diaper change while your baby's chest stays covered and cozy, then zip back up and slip out of the room.
Sizes run from 0–6 months up to 18–36 months, so you can size up as your baby grows rather than retiring the idea after a few months. There's a big range of sweet prints, too, from gentle elephants to stars and florals. When our own little one outgrew her Classic bag, we were genuinely sorry to see it go.
Why we love it
- Breathable organic cotton muslin that only gets softer with washing
- Can't be kicked off, so your baby stays covered all night
- Bottom zipper for quick, low-fuss night changes
- Sizes that keep going well into the toddler years
Worth knowing
At 1.0 TOG, this is a lighter layer rather than a winter-weight bag. On a cooler night, warmer pajamas underneath do the job, as long as your baby isn't sweaty or hot to the touch.
For a soft, safe swap for the crib blanket, this is the sleeping bag we'd buy.
Shop the aden + anais Sleeping Bag on Amazon
HALO SleepSack 100% Cotton: for warm nights
If your nursery runs warm, or you're shopping for summer, the HALO SleepSack is a lovely alternative. It's made from soft, slightly stretchy 100% cotton interlock with a lighter 0.5 TOG rating, and like the aden + anais bag it's sleeveless with an inverted zipper for easy changes.
The roomy sack is recognized by the International Hip Dysplasia Institute as hip-healthy, and sizes start at newborn, so it can go straight from the hospital bag to the crib. Choose the size by your baby's weight.
Simple, breathable and easy to wash, it's the one we'd reach for when the nights get sticky.
Shop the HALO SleepSack on Amazon
Getting the most from a sleeping bag
Keep the crib bare. The sleeping bag replaces the blanket, so there's no need for a quilt, bumper or pillow. A firm mattress, a fitted sheet and your baby on their back is all the crib needs. Loose blankets can wait until after the first birthday.
Dress for the room. A good rule of thumb is one layer more than you'd be comfortable in. Feel the back of your baby's neck: warm and dry is perfect, sweaty means take a layer off. Skip hats indoors.
Get the fit right. The neck and armholes should be snug enough that your baby can't slip down inside the bag.
Choose an unweighted bag. Pediatricians advise against weighted sleep sacks and swaddles, and neither of our picks is weighted.
Moving on from the swaddle? Once your baby starts showing signs of trying to roll, it's time to stop swaddling, and a sleeping bag is the natural next step.
For supervised tummy time and awake-time cuddles, our guide to choosing the right baby blanket covers the options, and our aden + anais Dream Blanket review is all about the blanket we love for cuddles and the toddler years.
Our verdict
The aden + anais Sleeping Bag is the easiest way we know to keep your baby cozy without a loose blanket in sight. It's breathable, soft and simple to use in the middle of the night, and it grows with your child for years. If your home runs hot, pick up the lighter HALO SleepSack instead. Either way, you'll both sleep a little easier.
