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A baby sleeping bag, often just called a gro bag, is a wearable blanket your little one cannot kick off in the night. It keeps them at a steady temperature without loose bedding near their face, which is why sleep charities recommend them over sheets and blankets for younger babies. It earns its place because it takes the guesswork out of layering and helps avoid those 3am cold-baby wake-ups.
What to look for
- The right tog. A 2.5 tog suits a typical UK nursery of around 16 to 20 degrees, so it is the most useful all-rounder for autumn and winter.
- A sensible fit. Buy by weight and age, and check the neck and armholes are snug so a small baby cannot wriggle down inside it.
- Easy washing. Cotton that survives a 40 degree wash and a tumble dry matters more than you think once the inevitable happens.
Our pick
Our pick is a 100% cotton sleeping bag in the standard 2.5 tog, sized for roughly six to eighteen months. It has a side or front zip for easy nappy changes, a fitted neck and no hood, and it is machine washable. It is a solid choice for cooler nights and for parents who want something that meets recognised UK safety standards rather than a generic import. If your room runs warmer, a 1.0 tog version of the same bag is worth having too.
One honest note: you do not need the priciest design or a licensed character print to get a good night. The plain cotton versions do exactly the same job for less, so spend the saving on a second bag for the wash basket instead.