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10 May 2021

Revealed: the most popular cot mattress brands of 2021

Find out whether the brands parents love are also the ones our testing recommends
Parents and baby looking at laptop

Your baby deserves a comfortable and safe night's sleep. But as our tough tests prove, opting for a well-known brand doesn't guarantee you'll get a safe and supportive cot mattress.

Our independent reviews can help you choose the best cot mattress for your baby, but we also ask parents about whether they're happy with their purchase and which brands they would recommend to a friend.

So whether you've got your eye on a cot mattress from John Lewis, or you'd prefer to buy from Ikea, first find out the brands parents really rate, and what our testing has uncovered about them.

See the full results in our round-up of the best cot mattress brands.

Hand pressing on mattress

The most popular cot mattress brands

In February 2021 we asked 1,878 parents which brand of cot mattress they owned.

A total of 24 brands were identified, with the following five being the ones most parents owned:

But whilst these brands are the most popular, when we asked parents how satisfied they were with them, and if they would recommend that brand to a friend, the feedback was varied.

The best and worst cot mattress brands

One of the most popular brands was our top scorer - receiving an impressive customer score of 83%. Whilst another is one of the worst-rated brands in our survey, getting a 59% customer score.

In fact, when we compared ownership of the five top scoring brands with ownership of all the other brands, we found that seven in 10 parents don't own a mattress from a top five brand.

graph showing percentage of ownership of cot mattr

This means it really pays to do your research.

By checking which brands are rated by parents and reading our expert reviews, you can find the perfect cot mattress for your little one.

See the best and worst cot mattress brands, or head straight to our best cot mattress reviews.

Cot mattress brands tested

Which? cot mattress testing is tough. It uncovers unsafe products and highlights the best of the best.

Our tests check:

  • A cot mattress is firm enough to support your child as they grow.
  • That it will lie flat in a cot bed without there being any unsafe gaps at the edges.
  • And that it's durable enough to remain supportive and safe to use after two to three years of use.

We also put the cot mattresses through rigorous safety tests, making sure they don't have any choking hazards such as unsafe zips, and don't present a suffocation risk by being too soft.

Only cot mattresses that are safe, firm and durable are recommended.

Below are some of the most popular brands we've tested.

John Lewis spring cotbed mattress

John Lewis

Number of mattresses we've tested: 2

Price range: £140 - £200

John Lewis was the sixth most-popular brand in our 2021 survey, with 7% of parents owning one of their cot mattresses.

Last year, they issued a voluntary recall on their Dual Purpose Pocket Spring Cotbed Mattress due to issues first uncovered in Which? tests.

However, we've also tested their pocket spring cot bed mattress - which has dozens of small springs, each wrapped in an individual cloth pocket. Pocket-sprung mattresses have a reputation for having better, more targeted body support. But does it provide the flat, firm surface needed to support your growing baby?

Read our full John Lewis Pocket Spring Cotbed review.

Ikea Krummelur cotbed mattress


Number of mattresses we've tested: 4

Price range: £45 - £129

One in 10 parents from our 2021 survey own an Ikea cot mattress, making it the joint most-popular brand.

They have both foam core, and pocket sprung cot mattresses. In general, foam cot mattresses are cheaper but can lose their shape and dent more easily than sprung cot mattresses.

The Krummelur is their cheapest cot mattress we've tested, and it comes with a cover that's machine washable at 60°C - perfect for killing off germs and bacteria. But is it firm, and durable?

Read our full Ikea Krummelur review.

Mamas and Papas Essential Pocket Spring Cot bed Ma

Mamas & Papas

Number of mattresses we've tested: 4

Price range: £35 - £199

One in 10 parents we surveyed have a cot mattress from Mamas & Papas, making it the joint most-popular brand, along with Ikea.

We've tested foam, pocket sprung and even dual-core (pocket springs and fibre) models, but which Mamas & Papas cot bed mattresses performed well in our robust lab tests?

Read our Mamas & Papas cot mattress reviews.

Little Green Sheep natural twist cot bed mattress

The Little Green Sheep

Number of mattresses we've tested: 1

Price range: Around £200

The Little Green Sheep is a less widely owned brand, with only 2% of parents we surveyed owning one of their cot mattresses.

However, we've highlighted them here as they have cot mattresses made from natural fibres, which are one of the firmest types of cot mattress. This may sound uncomfortable for an adult, but safety experts recommend an extremely firm and flat mattress as the best choice for your baby.

Little Green Sheep claim their natural twist mattress is free from harmful chemicals or toxins. But will it stay firm after years of use?

Read our Little Green Sheep Natural Twist review.