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Choosing a baby sleeping bag: TOG, size and sleeves

Choose a baby sleeping bag by its TOG rating, which matches the bedroom temperature, and by your child's length. Then decide on sleeves.

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Short answer: Choose a baby sleeping bag on two things: the TOG rating, which matches the temperature of the bedroom, and the length, which matches your child's length. Then decide on sleeves or no sleeves, and whether you want a swaddle bag for the first weeks.

The details below come from the manufacturers and the product data. LeBaby does not test anything. Always follow the instructions of your sleeping bag's maker, and ask your health visitor or baby clinic for advice about sleep.

What is a TOG rating?

TOG stands for Thermal Overall Grade. The number tells you how well the fabric holds warmth. A low TOG is a thin, light bag, a high TOG a thicker, padded one. Makers put the rating in the product name, such as 0.5 TOG or 2.5 TOG.

Where summer ends and winter begins differs per brand. In the product names you see for example:

Some bags have two layers for two seasons. Puckababy gives 0.5 and 0.25 TOG for the Bag 2 Seasons.

Sleeping bags from summer to winter

Which TOG for which room temperature?

Many makers publish a table of room temperatures with their bags: the colder the room, the higher the TOG. Jollein, for example, gives this chart for its own bags:

Jollein sleeping bagRoom temperature
0.5 TOG without sleeves18 to 27 °C
2.0 TOG with or without sleeves16 to 22 °C
2.5 TOG with or without sleeves16 to 20 °C
3.0 TOG with sleeves13 to 20 °C

The same chart shows what your child wears underneath: just a bodysuit in a warm room, a bodysuit with a cardigan or pyjamas in a cooler one. Jollein also notes that you do not add up the TOG ratings of layers. The ranges differ by brand, so always check the table on the label or the website of the brand you buy.

Measure the bedroom temperature with a thermometer rather than guessing, and note the difference between day and night.

The TOG rating follows the season and the room temperature.

The right length

Sleeping bags are sold by length in centimetres, often with an age next to it. Lodger, for instance, sells the Hopper Solid 2.5 TOG in 62 cm, 80 cm and 104 cm. ergoPouch gives an age range next to the length, such as 8 to 24 months for the 90 cm bag with sleeves.

Use the brand's size chart: the maker says which length of child each size fits.

Sleeves or no sleeves

Many baby sleeping bags are sleeveless. There are bags with sleeves too, such as the ergoPouch Jersey sleeping bag with sleeves 2.5 TOG, and models with zip-off sleeves, such as the Meyco Winter Moon. With zip-off sleeves the same bag works on cold and slightly warmer nights.

For older children there are larger toddler sleeping bags. Puckababy gives from 2.5 years for the Bag Kidz.

With sleeves, zip-off sleeves and for toddlers

A swaddle bag for the first weeks

A swaddle bag keeps the arms close to the body. Some double as an ordinary sleeping bag, such as the ergoPouch Cocoon, which the brand calls a 2-in-1. The manual says until when you use it as a swaddle. Swaddle bags and wraps are also under swaddles.

The EN 16781 standard

Baby sleeping bags have their own European standard, EN 16781. It applies to sleeping bags in which a child sleeps unsupervised in a cot, for children up to about 24 months. The standard sets requirements for, among other things, the neck opening, the maximum TOG rating and the information and warnings the maker provides. A new edition, EN 16781:2026, came out in 2026. The product data or the label says whether a bag meets the standard. More about the bed itself is in crib, bedside crib or cot.

Compare every model under sleeping bags.

Frequently asked questions

Which TOG rating does my baby need?

That depends on the bedroom temperature: the colder the room, the higher the TOG. At Jollein, for example, that is 0.5 TOG from 18 °C and 2.5 TOG between 16 and 20 °C. Check the table of the brand you buy, because the ranges differ by brand.

Which size sleeping bag should I buy?

Use the brand's size chart. The length in centimetres goes with your child's length, and there is often an age next to it.

Do I need a summer and a winter sleeping bag?

Not necessarily. A bag with zip-off sleeves or two layers covers more seasons. On warm summer nights a thin summer bag comes in handy.

What does the EN 16781 standard cover?

EN 16781 is the European standard for sleeping bags in which a child up to about 24 months sleeps unsupervised in a cot. It sets requirements for, among other things, the neck opening, the maximum TOG rating and the product information. Whether a bag meets it is in the product data or on the label.

Keep looking

LeBaby doesn’t test products. This guide sets out what the standards and manufacturers say. Always follow the manual of your own product.

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