Designed to be halfway between a traditional sleeping bag and ordinary nightwear, a baby sleeping bag is, essentially, a fabric vest (with or without sleeves, depending on the brand) that ends in a wide, cosy bag for the legs. The “clever” in this sleeping bag’s name refers to the innovative and useful features, including a pushchair belt opening for easily strapping the baby in while wearing the sleeping bag, adjustable arm openings, and a two-way zip that opens from the top or bottom to allow for easy changes. Experts recommend that you keep your baby’s crib free from blankets, pillows and toys until their first birthday, as a precaution against SIDS. Baby sleeping bags are the ingenious alternative which keep your baby cosy and safe while they sleep. What’s more, the best baby sleeping bags zip or popper closed so that you don’t need to worry about your child wriggling out of their bedding and waking up chilly - especially as many of us are watching the thermostat more carefully this winter.

We have the super love merino ones which are also 0-2. They are much thinner than usual ones so not bulky. They have poppers under arms to use when small so they can’t slip down. Ds started using around 3-4 months and they seems comically long, but after a month is so seemed to fit perfect. He’s still using now at 1 year and they feel lovely and soft still. They still have growing room." (Recommended by Mumsnetter Caspianberg) Our verdict With a variety of styles, functions and price points now available, which sleeping bags fulfil their promise of a peaceful night's sleep? Keep reading to find out which ones impressed us most.

Why you should trust us

Superlove baby sleeping bags come in at the top end of the price scale, but they feature such gorgeous Merino wool, they are totally worth investing in if you have the cash to splash. In fact, studies have shown Merino wool actually improves babies sleep patterns by creating a cosy and breathable microclimate. We've always used JoJo Maman Bebe ones and they're brilliant, wash well, are comfortable and they last." (Recommended by Mumsnetter MummyDummyNow) If you’re unsure about the level of warmth, material, fit or closure to look for in a baby sleeping bag, our brief guide will point you in the right direction. Fit Of course, it goes without saying that the washed sleeping bag should be completely dry and cool before it’s used again for bedtime – damp fabrics can make a baby cold, and metal poppers and zips can burn straight from the tumble dryer. How much do baby sleeping bags cost?

This one’s made from soft and stretchy cotton jersey and has a cute star print. As well as the nappy changing zip, there’s a zip at the side for getting your baby in and out of the sleeping bag with ease.Mumsnetters really rate Snuz products, which appear in our guides to the best moses baskets as well as the best cot beds. Both organic cotton and bamboo viscose are eco-friendly and hypoallergenic. Best of all, poppers on each side can be opened to convert the Cocoon Swaddle Bag to a sleeping bag. ErgoPouch recommend doing this as soon as your baby can roll, but this is a great bit of flexibility that may come in handy if your baby suddenly decides they prefer their arms unencumbered, and it’s not one we saw in any other product. With its unique half-moon zip, changing nappies is a doddle when your baby wears a Snuzpouch. Anything that makes those late-night changes any less disruptive to everybody’s sleep is a winner in our book. Almost all brands will state whether they comply with the safety standard in the accompanying instructions. If it’s not mentioned, you can follow up with their Customer Service department.Kate Holmes says, “Use the correct tog rating for the time of year. It isn’t necessary to use additional bedding when using a sleeping bag.” We had a dinky baby. The snuz sleeping bags have poppers on the side to make them a bit more snug for the littler babies. Helped us, also meant we didn’t have to buy hundreds." (Recommended by Mumsnet user rosed1008) Our verdict