Tommee Tipps

A baby sleeping bag can keep your little one warm and snuggly. Read our guide to discover which togs to use when and how to safely use your sleep bag.

A Guide to Sleeping Bags for Babies

Baby sleepbags are a great way to keep your little one safe and comfortable as they snooze.

They're available in all sorts of super cute designs and sizes, and also come in a range of weights and tog ratings for different seasons.

Read on to learn all about baby sleepbags, and which type is right for your baby.

What are the benefits of using a baby sleeping bag?

Lots of parents choose to dress their baby in a sleeping bag instead of using blankets or sheets which can pose a risk of suffocation and overheating. If you do use a lightweight blanket, make sure it's not tucked in higher than their shoulders and that they're in the "feet to foot" position, with their feet at the end of their cot or Moses basket.

Sleeping bags are basically wearable blankets for babies that keep them comfortable and at a safe temperature as they sleep. They are safer for little ones because there's no need for blankets, so their head remains safely uncovered, reducing the risk of suffocation.

The other benefits of baby sleeping bags include…

  • They help baby to stay at a constant temperature.
  • Your baby can move around in the bag but still stay covered and cosy.
  • They're really handy for night feeds.
  • They mean that there's no need for additional covers that baby could kick off or get tangled up in.
  • They promote good sleep and become a recognisable part of your little one's bedtime routine.

Three-stage baby sleepwear

At Tommee Tippee, our sleepwear range comes in three parts, and is either made using super soft cotton or a premium mix of bamboo fibres, cotton and ALOEKIND™.

Stage 1: Swaddlebag

Available in 0-3 and 3-6 months, our newborn-friendly Swaddlebag keeps your little one’s arms tucked into their body as they sleep, helping them to feel safe and secure, just like they did in the womb! Swaddling reduces their startle reflex and prevents wakeups caused by wriggly arms. It also maintains a safe sleep temperature, so there’s no need for blankets or sheets.

Getting your little one settled in their Swaddlebag is easy. Open the zip from top-to-bottom, gently tuck in your baby’s arms and fasten the zip from the top down around their feet. Your baby can be swaddled with their arms in, or you can let one, or both arms out to stretch when they’re almost ready to transition to a Sleepbag.

Come change time, just unzip the Swaddlebag from the bottom for a fuss-free fresh nappy that won’t disturb your baby.

Stage 2: Sleepbag

Available in 6-18 and 18-36 months, our Sleepbag makes the transition from swaddle to sleep suit super easy. It’s made using the same premium fabrics that’re kind to your baby’s delicate skin and opens top-to-bottom (starting near their chin and finishing at their toes) to avoid irritation and mid-night escape missions!

Our Sleepbag opens flat, so you can just gently pop baby’s arms through the holes so they can stretch out, while a signature Snugfit™ design promotes a ‘frog-legged’ sleeping position that supports healthy hip development as your baby grows.

Again, like the Swaddlebag, our Sleepbag unzips from the bottom for a nappy change that your baby will hardly notice!

Stage 3: Steppee

We know how it goes, one moment you’re eagerly waiting for them to learn how to crawl, the next they’re toddling around the house like a seasoned pro!

Our Steppee makes playtime and adventures before bed and in the morning a breeze. Just pop in both feet, then both arms, and zip from chin to tootsies to get set for sleep time.

Nurturing your toddler’s independence and encouraging them to jump, explore, and play when they’re not snoozing, it has snug openings for their feet and fold-over foot covers with grippy, no-slip soles that’re perfect for the chillier months of the year.

Snug, safe and super versatile, it’s available in 6-36 months, and comes in 1.0 to 3.5 tog, so no loose covers required!


What size sleeping bag should my baby wear?

Your baby's head shouldn't be able to pass through the neck hole when their sleepbag is fastened. If it can, the sleepbag is too big for them. Remember to check the weight of your child and refer to the chart below.

Remember, these are recommendations only as all babies are different…

Sleepwear Size  Baby's Height Baby's Weight
0-3 Months  up to 62cm 7-13lbs 8oz / 3.2-6.1kg
3-6 Months  62-68cm 13lbs 8oz -18lbs / 6.1-8.2kg
6-18 Months  68-86cm 18-25lbs / 8.2-11.3kg
18-36 Months 86-98cm from 25lb / 11.3kg

What tog should my baby wear?

Tog stands for Thermal Overall Grade. It’s a measure of warmth, rather than thickness. A product’s tog value is determined by a lab test. Basically, the higher the tog rating, the warmer the product.​

The temperature of the room your baby sleeps in will influence the tog that's required. The pieces in our sleepwear range come in 3.5, 2.5, 1.0 and 0.2 tog.

Here's a breakdown of which tog should be worn when…

 Sleep Bag Tog  Room Temperature
3.5 Tog Designed for winter months and cold rooms below 14°C / 57°F
2.5 Tog Designed for year-round use and room temperatures between 14-20°C / 57°F-68°F
1.0 Tog Designed for warm summer months and room temperatures between 20-24°C / 57°F-75°F
0.2 Tog Designed for heatwaves, hot weather, and very warm room temperatures above 24°C / 75°F

To see you from one season to the next, you might want a few sleepbags in different togs for each season, or a middle-of-the-road bag like our All-Season Sleepbag to cover year-round wear.

What should my baby wear with their sleeping bag?

Generally, the warmer a room is, the less your baby needs to wear under their sleeping bag. Remember that all babies are different, and you'll soon learn what your little one is comfortable in.

To help you out, here's a rough guide to baby sleepwear and layering according to temperature…

Room Temperature Sleep Bag Tog  Clothing Under Sleep Bag 
 27°C / 81°F and above 0.2 Tog

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24-27°C / 75-81°F 0.2 Tog

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Sleeveless Cotton Body Suit

22-24°C / 72-75°F 1.0 Tog

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Sleeveless or Short Sleeved Cotton Body Suit

20-22°C / 68-72°F 1.0 Tog

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Short or Long Sleeved Cotton Body Suit

18-20°C / 64-68°F 2.5 Tog

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Long Sleeved Cotton Body Suit

16-18°C / 61-64°F 2.5 Tog

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Sleepsuit or Pyjamas

14-16°C / 57-61°F 2.5 Tog

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a graphic icon of a short sleeved vest and a graphic icon of a baby pyjamas

14-16°C / 57-61°F 3.5 Tog

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Long Sleeved Cotton Body Suit or Sleepsuit or Pyjamas

14°C / 57°F and under 3.5 Tog

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a graphic icon of a long sleeved body suitand a graphic icon of a baby pyjamas

Long Sleeved Cotton Body Suit and Sleepsuit

or Long Sleeved Cotton Body Suit and Pyjamas

Your baby shouldn’t become too warm in their sleeping bag, as long as you choose the correct tog for the room's temperature and they're not wearing too many layers underneath it.

If you can, choose a sleep bag with no sleeves or detachable sleeves, and don’t use any clothes or bedding that your little one could get tangled up in.

Signs a baby is too hot can include them…

  • Feeling hot or sweaty to touch on their tummy, neck or back
  • Having damp hair
  • Flushing in the cheeks
  • Increasing their breathing rate

To monitor their temperature, The Lullaby Trust suggests feeling “your baby’s chest or the back of their neck (your baby’s hands and feet will usually be cooler, which is normal). If your baby’s skin is hot or sweaty, remove one or more layers of bedclothes.”