Baby Sleep Sack

Home Nursery Sleep Sacks
Newborn baby wrapped in a floral swaddle with matching headband on a white background

Swaddles

Newborn baby wearing a blueberry onesie on a white background

Baby Pajamas

Light green rectangular mat on a white background

Crib Sheets

Child holding a white blanket on a light background

Baby Blankets

A green lovey with a soft, solid pattern, designed for infants. It has a loop on top for attachment.

Loveys

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baby girl wearing cuddle sprouts hypoallergenic sleep sack

Not Your Average Baby Sleep Sack

Our baby sleep sacks are quilted wearable blankets designed to keep your little one cozy while still allowing natural wiggles and movement. Made with our TENCEL™-based TierraLuxe™ fabric, they feel buttery-soft, breathable, and gentle on sensitive skin—plus the convenient 2‑way zipper makes nighttime changes so much easier. For a complete bedtime outfit, layer your sleep sack over baby pajamas or a convertible footie pajama, if you want to learn more about what to wear under a sleep sack read our blog.

Cuddle Sprouts hypoallergenic sleep sacks

How to Choose the Right Sleep Sack Size for Your Baby

To choose the right size, aim for a snug neckline and arm openings (not overly wide), with plenty of room through the hips and legs for comfortable movement. If you’re transitioning from baby swaddles, a sleep sack is a cozy next step—and many little ones keep using them until they’re ready for baby blankets. To finish the nursery setup, mix and match with breathable crib sheets and a soft lovey.

FAQ'S

It depends on room temperature. Common options are a bodysuit or pajamas underneath. The goal is comfortable warmth without overheating.

A sleep sack should be snug around the neck and arm openings (so it doesn’t ride up), with room through the hips and legs for comfortable movement. Always follow the brand sizing guidance.

Many parents begin using a sleep sack once baby has outgrown the swaddle stage or when they want an easy wearable layer for sleep. The right timing depends on your baby’s sleep development and your family’s routine.

Baby sleep sacks, also referred to as baby sleeping bags, are a style of baby sleepwear that is essentially a wearable blanket. Sleep sacks are designed to keep your infant or young child safe, comfortable, and warm during sleep. The standard sleep sack design features openings for the baby’s neck and arms while forming a pouch around the legs. This allows enough movement while staying safe throughout the night. 

Sleep sacks are a safe addition to your baby’s sleepwear collection. These transitional sleep sacks offer a safe shift  away from or an alternative to a swaddle. Sleep sacks are a safer alternative to traditional blankets and loose sheets in the crib or bed, reducing the risk of suffocation or overheating. They provide a cozy sleeping environment for babies, allowing them to move their legs and arms freely while still feeling snug and secure. All of our baby sleep sacks are designed in accordance with CPSC safety regulations and the most recent sleep safety research.

TOG on baby sleep sacks stands for Thermal Overall Grade. This grade, or measurement, is a representation of the warmth and thermal insulation of the garment. The higher the TOG rating, the warmer the baby sleeping bag will keep your baby. Our  sleep sacks are currently available in 1.0 TOG, providing optimal warmth and comfort for every season.

To help ensure baby safety and comfort while sleeping in a sleep sack, choose the appropriate size and dress the baby appropriately underneath. To find the right size, ensure the collar doesn't cover the baby’s airways when the baby is lying down on their back. Check that the arm openings are not extremely wide, while still providing room for the baby’s arms to freely move outside of the sleep bag. There should also be ample room for movement of the baby's hips and legs. For optimal comfort, dress your baby in a base layer that is appropriate for the room temperature and sleep sack TOG. We recommend choosing sleep sacks crafted with soft, breathable, and thermoregulating fabrics, like TENCEL™.