Updated Feb 03, 2024

If you’re not familiar with a baby sleep bag it's probably because you've heard it referred to as a sleep sack. We have 4 reasons you’ll want to try using a baby sleeping bag, especially as colder weather approaches.

baby wearing toddler girl sleeping bag in crib

Featuring toddler girl sleeping bag from Lana Leopard Collection

What is a Sleep Sack Exactly?

A sleep sack is essentially a baby blanket that zippers up and around and is worn at nap time or bedtime. The baby’s feet are warm and cozy inside while the arms remain free, just like yours would be if you slept in a sleeping bag. Most sleep bags are sleeveless for optimal air circulation.

Why Use a Sleep Sack for Baby?

So, why do babies need sleep sacks? Aside from being adorable, sleep sacks have many benefits for your baby. These wearable blankets, like mini-infant sleeping bags, are adored among parents. Babies' sleep sacks are famous for their safety, security, and overall sleep time satisfaction. Our Posh Peanut baby sleep sacks are gentle on skin yet durable and long-lasting.

Posh Peanut apparel is made from viscose from bamboo fabric which is incredibly soft, silky, breathable, and moisture-wicking. This makes our baby sleep sacks especially appealing.
How many sleep sacks should I have? Owning 2 or 3 baby sleep sacks at a time should be sufficient, but you can always have more on hand for variety. One sleep sack will not be enough if you have it in the wash and the baby needs to wear it.

baby boy wearing camo print baby sleeping bag with long sleevesFeaturing toddler sleep bag from Cadet Collection

The 4 Baby Sleep Sack Benefits

1. Sleep Sacks Work Towards Injury Prevention

According to the American Academy of Pediatrics, a whopping 10,000 infants and toddlers get injured in their crib and playpen This number is likely even higher due to incidents that go unreported. This statistic is a crucial concern for parents. We only want to protect our babies from the moment they are born…even before.

One of the benefits of sleep sacks is that they allow you to be proactive in your safety approach, as safe sleep habits are essential. Any injury prevention measures you can take will give you peace of mind while your baby sleeps peacefully. Your baby’s mobility will be limited inside their sleeping sack, which is a good thing while they are in the crib. With their feet nestled inside the sleep sack, they will not be able to get a leg wedged between crib slats or rails.

Your baby can still kick their legs around inside the sleeping sack. This way, they will not feel stifled while asleep, but they cannot become uncovered during the night. A properly fitting sleep sack will not slide up over your baby’s face no matter how much they fidget or fuss.

2. Sleep Sacks Support Ideal Temperature Regulation

Ensuring your baby is comfortably toasty but not too hot while sleeping is essential.
Baby sleep sacks help regulate your baby’s temperature while they are calm and comfortable in their crib. Using the Thermal Overall Grade (TOG) unit of measurement, our sleep sacks work with the room temperature of the baby’s nursery. The sleep sack’s TOG determines the thermal insulation of the fabric.

TOG guide for baby sleeping bags

Posh Peanut’s sleep sacks for babies come in three different TOGs:

If you keep your house or nursery between 23 - 26 °C / 74 - 78 °F, we suggest the .5 TOG.
If you keep your house or nursery between 21 - 23 °C / 69 - 73 °F, we suggest the 1.0 TOG.
If you keep your house or nursery between 16 - 20 °C / 61 - 68 °F, we suggest the 2.5 TOG.

Which baby sleep sacks are best for colder seasons? Go for the 2.5 TOG sleep sack. This TOG level will keep your baby feeling warm all winter during the extra-cold months without overheating. A TOG measure of .5 is the best choice for year-round wear if the weather doesn’t change much where you live. 1.0 TOG is perfect for those in-between temperatures. You may need different sleep sacks at different stages and seasons.

3. Sleep Sacks are Better Than Baby Blankets

When you swaddle your baby, a regular blanket is not necessary. Your little one will be snug in their tight swaddle. Once your baby has grown out of the swaddle stage, they still need to stay nice and warm while they sleep. Naturally, we think of baby blankets to provide warmth when babies are no longer being swaddled. While a blanket keeps your baby warm, it can be unsafe.

Infants can suffocate by rolling over or inside the loose blanket, getting caught up in the material. This can become a real risk for SIDS (Sudden Infant Death Syndrome). While this is an uncommon occurrence, it is something to take seriously. Using a baby sleep sack eliminates the need for a baby blanket while still providing the comfort your baby requires for a good night’s sleep. Having nothing else in the crib with your baby is the best bet, and a baby sleep sack solves that problem!

4. Sleep Sacks are the Next Best Step After Swaddling

If you have started swaddling, a baby sleep sack is the next natural step for your little one. A sleep sack will give your baby the security of a swaddle, with more room to wriggle around. After all, time flies and your baby will be moving more and more every day. The swaddling stage is sweet and sentimental but short-lived.

When to Transition to a Sleep Sack?

Generally speaking, infants can move from a swaddle blanket to a baby sleep sack at around eight weeks old or when they start showing signs of trying to roll over. Naturally, every baby is different developmentally. Some babies may need more time with the swaddle. Infants who can fit into a sleep sack right away and prefer to have their hands free to self-soothe can safely sleep in one from the very start. Wait and see!
As you learn your baby’s sleep habits, you will soon find out what works best for you and your baby. Remember, the better your baby sleeps, the more sleep you will get. And you both need plenty of rest! Can you relate?

Your baby’s sleep sacks can last for years. They are long and roomy, with plenty of sleep space as your baby gets bigger.

When to stop using a baby sleep sack? You can continue to use a sleep sack until your baby grows out of it or begins walking as a toddler. As a parent, you will know when to ditch the sleep sack, and when it is time to pick out some adorable baby pajamas!

What Should Your Baby Wear Underneath Their Sleep Sack?

You shouldn’t put your baby in their sleep sack without comfortable clothing underneath. Naked is a no-no! So, what should a baby wear under a sleep sack? A one-piece outfit, a bodysuit, or something similar is ideal for your baby to wear underneath their sleep sack.

Depending upon the weather where you live and your home/nursery room temperature, select baby sleepwear that will be the most comfortable. You can choose clothing with short sleeves, long sleeves, footed pajamas, etc., combined with the TOG of the sleep sack as appropriate.


Final thoughts

Do you use a sleep sack for your baby? How is it going? If you have not yet used a baby sleep sack, will you try one after you are done with swaddling?Sleep sacks make great baby shower gifts too. Plus, they coordinate with our other Posh Peanut clothing and cute accessories.

Be sure to follow Posh Peanut on Instagram and Facebook for the latest product releases, to enter giveaways, and be the first to know about upcoming sales events! You can join our VIP Mamas group here.

We’d love for you to share some cute photos of your baby snuggled up in their baby sleep sack on our social media pages!

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