9 Baby Sleep Sacks With Long Sleeves 

Whether you live in a colder climate or your baby likes the cozy feeling, this is my go-to list of baby sleep sacks with long sleeves.

Having the right wearable blanket is key to a good night’s sleep!

?Safety Tip:

  • Your wearable blanket should not have loose fabric or be able to ride up over your baby’s face.  
  • Your baby shouldn’t be able to wiggle out of their sleep sack.
  • Choose breathable materials like 100% cotton over synthetic materials.
baby sleeping in a sleep sack with long sleeves

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Keeping Baby Warm At Night 

If you are searching for a long-sleeved sleep sack, you are probably worried about keeping your baby warm in a cooler climate.

As a new parent, I often used this temperature chart to help me determine what my baby should wear to stay warm at night. 

Baby sleep sack TOG chart.
Baby TOG Dressing Guide From Kitandtilly.com

What Is TOG?

Are you new to the TOG rating system? TOG stands for “Thermal Overall Grade” and tells you how warm a garment will be.

You can decide on what pajamas to wear under your sleep sack depending on the TOG rating of the sleep sack and the room temperature where your baby sleeps.

Love to Dream TOG chart.
What To Wear Under A Sleep Sack TOG Chart From Lovetodream.com


10 long sleeve sleep sacks.  How to keep your baby warm. mommymakerteacher.com. baby sleeping in baby sleeping bags with sleeves.

Sizes: Small (0-3 months), Medium (3-6 months), Large (6-9 months). 

Fabric: Microfleece 

My son lived in these for the first few months while lounging around the house and sometimes for naps. 

It has an inverted zipper for easy diaper changes—the saying “never wake a sleeping baby” is so true! So, make diaper changes when your little one is still sleeping.

My son quickly outgrew the sizes offered by six months. I also found they did shrink a bit in the wash.

We also liked to swaddle for long naps and nighttime sleep, so we used a regular swaddle blanket until it was time to transition from the swaddle. 

Overall, these were very cozy while they lasted; I wish they had bigger sizes!

Love to Dream
03/09/2024 07:57 pm GMT

Sizes: Medium (13-19 lb) and Large (19-24 lb)

Fabric: Cotton and a little elastane (for a soft stretch)

The Love To Dream Swaddle Up Transition Suit seems to do it all!

There are two types of removable sleeves: there are swaddle transition detachable sleeves that keep baby’s hands tucked up by their heads to reduce the Moro Reflex (startle reflex) when they are transitioning from the swaddle, and there are detachable long sleeves.

I love that your baby can wear this from a swaddle transition to a full range of motion throughout the year in warm weather (with short sleeves) and cool weather (with long sleeves).

It also features a two-way zipper, making it easy to put on and good for nighttime diaper changes.

Prevent Overheating

It’s essential to make sure that your baby doesn’t overheat.

  • Overheating has been linked to Sudden Infant Death Syndrome (or SIDs), according to The National Institute For Child Health And Human Development.
  • Check with your pediatrician for advice on monitoring your baby’s body temperature at night. 
  • According to the American Academy of Pediatrics, the recommended room temperature for where your baby sleeps is between 68 and 72 degrees.
03/10/2024 05:52 pm GMT

Sizes: Small (6-14lb) and Medium (14-21lb) 

Fabric: Cotton

My son started to roll early, so we needed to transition him from the swaddle early.

We chose the Transitional Swaddle Designs until he was big enough for Baby Merlin’s Magic Sleepsuit.

I liked that the sleeves had cuffs to keep his arms tucked in (to help with the Moro Reflex). We could eventually allow one arm out at a time, but we still had half sleeves for warmth. 

Sizes: 3-6 Months and 6-9 Months 

Fabric: Jersey and cotton or jersey and microfleece

We immediately ordered it once he was big enough for Merlin’s Magic Sleepsuit.

I can’t say enough good things about the sleepsuit. We love:

  • Soft jersey fabric.
  • Double zippers for easy changing.
  • The inner layer of polyfill keeps babies cozy and reduces the Moro Reflex.
03/09/2024 03:42 pm GMT

Sizes: 3 months to 3T 

Fabric: Soft, stretchy fabric: a lightweight polyester and spandex blend

When transitioning my son from the swaddle, my husband and I were between the Zipadee-Zip and Merlin’s Magic Sleepsuit.  

We ordered the Magic Sleepsuit first, which worked so well that we stuck with Merlin’s! 

I love that the Zipadee-Zip is great for babies ready for a sleep sack’s free range of motion but still offers the snuggly enclosed feeling of a swaddle. 

I also really like that it comes in a wide range of sizes to fit babies up to 3 or 4 years of age.

How to keep your baby warm. Long sleeve sleep sacks for cold nights. mommymakerteacher.com. Baby sleeping in a sleep sack baby sleeping bag with sleeves.

Pro Tip: If you don’t need a long-sleeved baby sleep bag, check out my complete guide to sleepsacks, swaddles, and wearable blankets that will take you from newborn to toddler.  

Sizes: 0-3 Months and 3-9 Months 

Fabric: Cotton 

I love the cotton fabric because cotton breathes better than microfleece to prevent overheat. 

They even have foldable cuff mittens to warm your baby’s fingers and prevent scratching.  

The big problem I ran into with these was that by the time my son was almost a year old, he was ready for a sleepsack, and the sizes didn’t work for us. 

Sizes: 0-6 Months and 6-12 Months 

Fabric: Cotton with polyester filling 

The Hudson quilted and cotton long sleeve baby sleep sacks are well made with a simple design.  

The quilting weight is a little heavier than a traditional swaddle blanket, which should help muffle the startle reflex more than a thin layer of fabric.

8. Love To Dream Sleep Suit 2.5 Tog 

Sizes: 6-12 Months and 12-24 Months

Fabric: Cotton with polyester fill 

This is it if you want a long-sleeved wearable blanket that is extra snuggly and warm! New to the Love To Dream family, the Love To Dream Sleep Suit is rated 2.5 TOG–which means it will keep your little one very warm! 

Innovative 2-in-1 feet allow you to easily cover and uncover your baby’s feet for playtime and sleep.  

I would have bought it if this was available for my son when I needed it. 

Sizes: Small (0-6 months) 10-18lb and Medium (6-12 months) 16-24lb.

Fabric: 100% Cotton.


  • This is a three-quarter-sleeve sleep sack.
  • It’s designed to be snug in the torso like a swaddle but allows full movement.
  • 1.5 TOG.
  • Quilted for extra coziness.
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I am the founder of Mommy Maker Teacher and a mom of two toddlers. With a degree in education, 12+ years of experience as a K-12 teacher and curriculum developer, and courses in childhood psychology and language acquisition, I share research-backed parenting tips and advice. I provide helpful content for moms on all stages of motherhood—from trying to conceive and pregnancy to postpartum, breastfeeding, and parenting.