Our latest cot mattress tests uncovered Best Buys that are safe for your little one to use, but we also discovered a Don’t Buy that’s not very durable as it significantly dropped in thickness after our tests.
The latest baby mattresses to pass through the Which? test lab come courtesy of Ikea, John Lewis and Tutti Bambini, with prices starting at around £90.
Find out the key features of each cot mattress and key advice from our experts to ensure a safe night’s sleep for your child.
Which? Best Buy cot mattresses – pick a mattress that lasts
John Lewis Spring Cotbed Mattress (£90)
Up for grabs at less than £100, you might have this John Lewis cot mattress on your shortlist if you’re on a budget. It has an open spring core and an outer cover that’s said to provide ‘a soft, breathable sleeping surface’.
The outer cover is machine washable and is claimed to be treated with anti-allergy Purotex.
A waterproof layer protects the core to prevent lingering odours, and to help you clean up quickly and easily when those night-time accidents occur.
Find out how this cot mattress scored in our test lab for body support, durability and safety. Head over to our full John Lewis Spring Cotbed Mattress review.
Ikea Jattetrott Mattress (£95)
This cot mattress from Ikea is described as ‘well ventilated’ and ‘durable’, so we sent it off to our lab to put those claims to the test. It measures 140cm long and 70.5cm wide, so it should fit all standard-sized cot beds on sale in the UK.
The outer cover is made up of multiple layers and it’s machine washable, which will help you treat the inevitable stains that come with raising a baby or toddler.
It has a small pocket where you can hide the zipper, which is useful as it will stop your child from playing with it and potentially getting ininside of the mattress.
Did this cot mattress impress us enough to be made a Which? Best Buy? Head over to our full Ikea Jattetrott review.
Tutti Bambini Pocket Spring Cot Bed Mattress (£89)
At the core of this Tutti Bambini cot mattress are 170 individual pocket springs wrapped up in polyurethane foam, designed to provide a soft sleeping surface for growing babies.
The top layer of the cot mattress is finished off with a layer of polyester that’s claimed to reduce perspiration, and keep children cool and comfortable.
The removable, hypoallergenic outer cover can be chucked in the wash when it needs freshening up and, as this cot mattress has a water-resistant finish, you shouldn’t have much of an issue with cleaning up after leaks and spills.
Can this cot mattress pair an affordable price with top-notch build quality? Read our Tutti Bambini Pocket Spring Cot Bed Mattress review to find out.
Ikea Drommande Mattress (£129)
This Ikea cot mattress is a little pricier compared with the Jattetrott, but not by much. It has a fixed inner cover that’s meant to make putting the outer cover on post-wash a simple task. That outer cover is machine washable at 40°C.
There are 170 steel pocket springs at the core of this Ikea cot mattress, kept secure by polyester webbing, and layers of natural latex and coir (coconut fibre). Although the mattress has been designed with Ikea’s own cot beds in mind, it should fit standard-sized cot beds from other big-name brands.
Like the Jattetrott Mattress, this model also has a useful carry handle on its side and a pocket for hiding the zipper from view.
Does this mattress offer enough support? Before you part with your money, read our full Ikea Drömmande review.
John Lewis Dual Purpose Pocket Spring Cot Bed Mattress (£200)
This cot mattress from John Lewis is the priciest option in our latest round of testing.
It’s a dual-spring mattress that offers varying levels of support depending on which side you flip it. In other words, one side has more springs than the other, which makes it feel firmer. John Lewis recommends the firmer side for newborns and the softer side for toddlers.
If you’re dealing with a spill, this cot mattress is machine washable at 40°C. But note that we prefer washing at 60°C for a more thorough clean.
The cover of the John Lewis Dual Purpose Pocket Spring Cot Bed Mattress is coated with anti-allergy Purotex.
How to ensure your baby sleeps safely
With temperatures on the rise in the UK this summer, you’ll want to take steps to make sure your baby doesn’t get too warm.
Have a look at our top tips below, backed by the Lullaby Trust, to keep your child comfortable.
For more details on how to ensure a peaceful sleep for your child, see our expert advice guide on baby safe sleeping tips. Alternately, head over to our cot mattress safety and baby bedding safety pages.
How we test cot mattresses
Every mattress that reaches the Which? test lab is cut in half so we can accurately assess the layers inside. To make sure they’re providing enough support for children, we use a 12kg and 20kg weight to see how the materials and construction holds up over time.
On a mission to find the best cot mattresses, we take off the removable cover of every model and wash it according to the manufacturer’s instructions.
This lets us find out how easy the cover is to clean and whether or not it will shrink over time. If it does shrink, the mattress could be compressed creating an unsafe gap where your baby could get trapped.