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Sleeping Bags

Find the Right Baby Sleeping Bag

From warm summer nights to chilly winter bedrooms, your baby's room temperature can change considerably throughout the year. A baby sleeping bag makes it easier to keep your little one comfortably covered without relying on loose blankets that can be kicked off during the night.

At Slumbersac, you'll find baby sleeping bags for different temperatures, with four TOG ratings and sizes from newborn onwards. The key is choosing the right combination of TOG, size and clothing underneath for your baby's sleeping environment.

Summer, Winter or All-Season Sleeping Bag?

Although sleeping bags are often described as summer or winter weight, it's the room temperature that should determine which TOG your baby wears.

For rooms above 24°C: 0.5 TOG
Our lightest summer sleeping bags have no padding and are designed for hot weather and particularly warm bedrooms.

For rooms between 18–24°C: 1.0 TOG
A lightweight choice for mild temperatures and warmer nights.

For rooms between 15–21°C: 2.5 TOG
Our versatile all-season option for cooler bedrooms and a popular choice through autumn, winter and spring.

For rooms below 18°C: 3.5 TOG
Our warmest sleeping bags, designed for colder bedrooms and winter nights.

Remember that clothing underneath counts too. You may need to add or remove a layer depending on the room temperature. Our TOG Guide has suggested clothing combinations to help.

What Makes a Good Baby Sleeping Bag?

The right fit

A sleeping bag shouldn't be bought in a larger size for your baby to grow into. The neck and armholes need to fit securely so your baby can't slip down inside the bag, while the lower part should provide plenty of space for their legs and hips to move naturally.

As a guide, your baby's feet should reach around three-quarters of the way down the bag. Slumbersac sizing is primarily based on height, so measure your child and check our Size Guide before ordering.

The right warmth

TOG is a measure of warmth rather than thickness alone. Choosing an appropriate TOG for the room, together with suitable clothing underneath, helps your baby maintain a comfortable temperature throughout their sleep.

To check your baby's temperature, feel their chest or the back of their neck. They should feel comfortably warm, not hot or sweaty. It's normal for hands and feet to feel cooler.

Safety-tested design

Slumbersac baby sleeping bags are tested to BS EN 16781, including requirements relating to areas such as fit, neck openings and fastenings.

Our TOG ratings are also independently laboratory tested, and we use soft, breathable fabrics with OEKO-TEX® Standard 100 certified materials.

You can find more information about our standards and testing in our Product Safety Guide.

Designed for Sleep – and Real Family Life

We've been making sleeping bags for babies and children for more than 25 years, so we know the little details matter too.

Depending on the style, Slumbersac sleeping bags include practical features such as detachable sleeves, adjustable armholes and covered zips. They're machine washable and tumble-dryer friendly, with a wide choice of colourful prints and simpler designs.

And as your little one becomes more mobile, you can also move on to our Sleeping Bags with Feet, which offer the same covered feeling with separate legs and feet for greater freedom of movement.

Questions Parents Ask About Baby Sleeping Bags

Do I need a different sleeping bag for summer and winter?

Possibly, but always go by room temperature rather than the date on the calendar. A warm bedroom may still need a lower TOG in winter, while a cooler room could require a warmer TOG at other times of year.

Is 2.5 TOG warm enough for winter?

2.5 TOG is designed for room temperatures between 15–21°C, so it can be suitable for many bedrooms during winter. If the room falls below 18°C, consider a 3.5 TOG sleeping bag instead.

Can newborn babies use sleeping bags?

Our newborn sleeping bags are designed for use from birth when your baby meets the size requirements. Correct fit is particularly important – the neck and armholes should be secure and the sleeping bag shouldn't be deliberately sized up.

Should my baby wear a vest or sleepsuit underneath?

That depends on the TOG and room temperature. Warmer conditions may only require a lightweight bodysuit, while cooler temperatures may need a sleepsuit, pyjamas or additional layer. Check our TOG Guide for suggested combinations.

When should I choose a Sleeping Bag with Feet?

There's no set age when you need to change. Sleeping Bags with Feet can be a useful option as babies and children become more active because the separate legs and foot openings give them greater freedom to crawl, stand and walk.