Best cot bed mattress: 8 top mattresses for babies and toddlers

We've researched all the options to help you choose the best cot bed mattress for you. Here are the 8 best cot bed mattress for your little one

best cot bed mattress
(Image credit: Little Green Sheep)

We've researched far and wide to help you find the best cot bed mattress for your little one. Chances are you'll have already found the best cot bed for your nursery – but the mattress which baby sleeps on is arguably one of the most important purchases when it comes to getting their nursery ready.

Because while we tend to focus on which style of cot bed or bedside crib suits the nursery best, the best mattress to go inside is a key decision. Cot bed mattresses need to be safe – which means they need to be firm, flat, and be an exact fit for the cot. They should also have good breathability and a waterproof covering (or a separate waterproof protector) so that they can cope with accidents.

Both the NHS and the Lullaby Trust advise that it’s best to choose a firm mattress for babies, so don't be surprised if your mattress arrives and it's a little firmer than you expected. A firm mattress can reduce risk of SIDS, which is also why second hand mattresses are a big no-no for babies. So while you'll want to find a mattress that's comfortable enough for your baby to sleep through the night (fingers crossed), your baby sleeps safest on a firm mattress rather than a softer one.

With so many cot bed mattress options out there, we've put together this handy guide to help make the decision process just that little bit easier. We've selected eight stand-out cot bed mattresses, and put together some useful information and tips at the bottom too, to help you decide on the best one for you and your baby.

Because aside from providing a safe and comfortable bed for your baby, the right cot bed mattress can play a big part in giving the rest of your household a chance at a decent night's sleep, too.

The best cot bed mattresses for 2021

Why you can trust Livingetc Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.

1. The Little Green Sheep Natural Twist Cot Bed Mattress

The best natural cot bed mattress

Specifications

Size: 70cm x 140cm x 10cm
Material: Organic coconut coir, latex, cotton and wool

Reasons to buy

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Double sided with 2 firmness options
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Natural, organic materials
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Breathable
+
Wool layer is temperature regulating
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Smells lovely, like sleeping on sheepskin

Reasons to avoid

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Not waterproof

The great thing about the Little Green Sheep cot bed mattress is that it has two sides; a firmer one for young babies, and a softer side for when they become toddlers. Therefore the mattress is perfect for cot beds, as it will last from birth right up until around the age of 3 (or when your child is ready for a new bed).

What we like
The firm side of the mattress supports small babies and the ‘twist’ in the name comes around the 12-month mark when it’s time to flip the mattress onto the side that's designed specifically for toddler comfort.

While this 70cm x 140cm size fits the majority of cot beds, The Little Green Sheep (opens in new tab) makes the exact same double sided mattress in smaller sizes too, including an oval shape that fits the Stokke Sleepi.

While its longevity is its biggest selling point, it's also a great natural option, free from synthetic materials, chemicals or fire retardant sprays, giving you peace of mind that your baby is sleeping in a pure and natural environment.

All the materials are breathable, hypoallergenic and free from chemicals and toxins. There's breathable cotton; coconut fibres for support; a natural latex layer for comfort; and a wool layer, which is hypoallergenic and temperature regulating. The core of the mattress is constructed from coconut fibres blended with natural latex that act like ‘thousands of tiny springs.’ The wool layer naturally absorbs and disperses moisture away, creating a clean, dry environment that’s resistant to dust mites & bacteria growth.

The mattress also comes with a five-year guarantee so should easily last until your child outgrows it.

What we don't like
The mattress is not waterproof and does not come with a removable cover, and is sponge clean only. Any nappy leaks or milk will soak through into the mattress unless you buy a waterproof mattress protector for it – which we highly recommend.

2. SnüzSurface Adaptable 70x140 Cot Bed Mattress

The best cot bed mattress for longevity

Specifications

Size: 70 x 140 x 11cm
Material: The cover is 100% polyester and the filling is Polyurethane CV foam, steel and polypropylene.

Reasons to buy

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Inter-changeable comfort layers within the mattress allow you to tailor the level of firmness for your child's size and weight as they grow
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Suitable from birth to max 7 years
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Anti dust-mite
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Waterproof mattress surface
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Removable washable waterproof cover

Reasons to avoid

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Synthetic

We were super impressed with the longevity of The Little Green Sheep's mattress, which already lasts much longer than most cot bed mattresses. Then we came across the SnüzSurface mattress which completely unzips and can be re-configured to suit toddlers and even children up to the age of seven. 

The SnuzSurface is the only mattress we've found that offers TripleCore, inter-changeable layers within the mattress that allow you to tailor the level of firmness for your little one's size and weight as they grow. Simply unzip the mattress cover and re-order the layers inside.

While the SnüzSurface isn't made from natural fibres like the option above, it does offer amazing value if it lasts you for several years.

What we like
SnuzSurface cot bed mattress is a great investment, as it's essentially three mattresses in one. The cot bed mattress adapts to provide the optimal level of support for every little sleeper, as they grow from baby to child. The SnuzSurface mattress arrives as a baby mattress, with a firm support that’s recommended by safe sleep experts. As they grow into a toddler and require a slightly more supple sleep surface, just unzip and reorder the comfort layers for a softer sleeping surface. 

It's also quite nice and reassuring to be able to see inside the mattress without it being completely sewn up and sealed. Then for the final level of support, re-order the layers to create the most comfortable surface suitable for the increased weight and size of your growing child, up to 22kgs.

The fabric feels very luxurious and soft. You would never guess that the top layer is actually waterproof as it it so soft and not crinkly.

What we don't like
While the mattress is super soft, it's entirely synthetic, so not the best choice for parents who are looking for something more natural. The cover is 100% polyester and the filling is Polyurethane CV foam, steel and polypropylene.

When you take it out of the box and unroll it, you need to leave it to settle for a week so you need to make sure you have it set up in advance. While the mattress is in theory suited to young children, realistically a child aged four to seven will be too tall to still be using a cot bed mattress.

Anything else?
The mattress arrives rolled up in a box, with warning labels that it needs to be unrolled immediately to protect the mattress springs. So if you don't already have somewhere to place or store the unrolled mattress, wait to order it until nearer the time that you need it.

When the mattress unrolls, it takes 7 days to completely flatten out. Don't be alarmed if it appears a bit crinkled and wrinkly at first, the mattress does straighten out.

A cot bed mattress will need to fit a cot bed perfectly, sitting snugly along the sides. When you first place this mattress in the cot bed you'll notice a gap – but after a week of breathing, the mattress will have filled out a bit more.

3. Eve Sleep cot bed mattress

The best cot bed mattress for regulating temperature

Specifications

Size: 60cm x 120cm x 12cm / 70cm x 140cm x 12cm
Material: Foam and springs

Reasons to buy

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Super breathable
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Antibacterial mattress cover
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Waterproof protector
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Suitable until your child is six
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30 night free trial

Reasons to avoid

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Synthetic

Eve Sleep (opens in new tab) is already well known for their quality mattresses, but not everyone knows that they offer cot bed mattress sizes too. The cot bed mattress is essentially a mini-me of its popular memory foam mattress, and is often praised for its cooling properties.

The mattress is made from a mix of springs and foam, is covered in a waterproof layer that protects it from spills, and comes in two standard cot bed sizes (60x120cm or 70x140cm).

The thick, durable foam layer protects the springs and doesn't dip or lose any of that all-important support. Meanwhile the individual pocket springs adapt as your baby wriggles and grows, providing the ultimate support for their body. Springs are also naturally breathable.

The mattress is also super breathable, with a 'Careful 3D fabric' cover which is a highly breathable two-layer material, separated by tiny dividers, encouraging better air circulation to keep your baby as cool as possible. 

What we like
The mattress cover is made from a special fabric that makes it super breathable. It's also had a natural antibacterial treatment that promises to keep bugs at bay. But to make sure things stay as clean as can be, it can be unzipped in an instant and popped in the wash at 60ºC.

The cover also has a waterproof laminate layer built in.

What we don't like
There's very little fault to find, but if we had one bad thing to point out it would be that the mattress is made from man-made materials.

4. Obaby Natural Coir and Wool Mattress

The best budget-friendly natural cot bed mattress

Specifications

Size: 70cm x 140cm x 10cm
Material: Coconut coir, lambswool and latex

Reasons to buy

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100% natural
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Breathable
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Natural anti bacterial properties
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Suitable for babies with allergies
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Comes with removable, washable cover
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Bamboo fabric cover (made from 100% bamboo fibre knitted together) is eco-friendly and super soft
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Bio-degradable
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Great value

Reasons to avoid

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Not double sided, so same firmness for babies and toddlers

Another natural, organic option is the Obaby Natural Coir and Wool Mattress. It sells itself on its natural, chemical-free materials, which protect against dust mites and help regulate your baby’s temperature.

The mattress is made up of a mix of coconut coir – a natural fibre taken from the husk of a coconut – and lambswool. The coconut coir is bonded with latex and is designed to feel like springs. The coconut core is wrapped in lambswool which offers optimum protection against dust mites. Lambswool also helps to regulate babies body temperature, is breathable and prevents moisture building up, plus it's perfect for babies or children who suffer from allergies.

Each mattress comes with a removable cover, made from organic bamboo (which has natural antibacterial properties). This can be unzipped and thrown into the wash.

What we like
It's a great choice for parents who value natural materials but are also budget conscious. Aside from offering a quality and comfortable mattress that's naturally breathable and has natural antibacterial properties, it's also great value and comes with removable cover too.

Choosing a cot bed mattress made from natural materials is ideal for babies and toddlers with allergies, plus when it's time to get rid of the mattress, you can do so with a clear conscience as it is biodegradable.

What we don't like
The only negative we can think of is that this mattress is not double sided, so it offers the same firmness for babies and toddlers.

5. Nutkin Toddler & Cot Bed Mattress from Great Little Trading Company

Best affordable cot bed mattress that offers the best value

Specifications

Size: 70cm x 140cm x 10cm
Material: Top: 100% Polyester; Base: 100% Polypropylene, with a purotex anti-allergy finish

Reasons to buy

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Micro pocket springs for comfort
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Removable and washable cover
+
Breathable layers
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Great value

Reasons to avoid

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Not double sided, so same firmness for babies and toddlers
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Synthetic

Great Little Trading Company (opens in new tab) is predominantly known for its cute kids room storage, rugs, bedding and nursery decor – but they do a great mattress too. Their Nutkin Toddler & Cotbed Mattress has breathable comfort layers and supportive pocket sprung construction, that offer a super comfortable night's rest.

What we like
The cot bed mattress contains a micro pocket spring unit wrapped in breathable fibre and features a breathable and water-resistant cover with an anti-allergy finish that can be washed at 60ºC.

The mattress is one of the more affordable options at just £125 and offers good durability with the removable cover.

What we don't like
The mattress is not double sided, so offers the same firmness for babies and toddlers. This means that it doesn't have as much longevity as some of the other more expensive options above. But it's great for the first year or two, before the baby moves on to a different bed.

6. Naturalmat Coco Mat Cot Bed Mattress

The best cot bed mattress to fit a range of cot bed shapes

Specifications

Size: Comes in all sizes including standard and oval shapes
Material: Organic Coir, Organic Lambswool, Natural Latex, Cotton

Reasons to buy

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There's a shape and size to fit every type of crib and cot out there
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Super soft and comfortable
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Removable machine washable cotton cover
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Made from 100% natural and organic materials
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Contain a natural anti-bed-bug and dust-mite formula
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Naturally breathable and self-ventilating
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Perfect for babies / children with allergies
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Made by hand to order in Devon, using wool from local Organic farms
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Biodegradable

Reasons to avoid

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Not waterproof

Made from 100% natural materials, the Naturalmat mattresses have a natural anti-bed-bug and dust-mite formula, and are also perfect for babies or children with allergies. Parents with babies that suffer from eczema will find it reassuring that the mattresses are treated with essential oils to remove dust mites – no chemicals or toxins which can often flare up skin conditions.

Handmade in Devon, the mattresses are naturally breathable and self-ventilating to help baby regulate their body temperature. The organic coconut fibres are not only breathable and self-ventilating (keeping cool in summer and warm in winter), but ideal for any asthma sufferers. 

The mattresses all come with a removable and machine washable cotton cover – ideal for accidents, and for general freshness.

What we like
Being made from natural organic material such as lambswool helps to regulate baby's body temperature easier. So where other mattresses might make babies and children feel sweaty in hot weather, this mattress promises to keep them cool in the summer months, and snug in the winter months.

We also love how well the mattress fits inside the cot bed – they are a perfect fit. While we tested the mattress to fit the Stokke Sleepi Cot Bed (122 x 70 x 9 cm), the Naturalmat mattresses (opens in new tab) come in an impressive 29 different shapes and sizes – all to fit cribs, cots and cot beds. So whether you have a standard cot, a small bedside crib, a moses basket or a specific shaped cot like the Stokke range or even the semi circle shaped Babybay, there will be a naturalmat mattress that's the perfect fit.

Plus, if your mattress arrives and isn't the right fit for you, naturalmat will exchange it for one that is.

What we don't like
It's not waterproof so you might want to consider a waterproof mattress cover.

7. Silver Cross TrueFit Premium Baby Cot Mattress

The best cot bed mattress for ergonomic comfort and a perfect fit

Specifications

Size: 140 x 70 cm
Material: Natural coir, foam, polyester padding, Tencel fabric

Reasons to buy

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A side for babies (0-18 months), and a reversible side for toddlers, extending mattress life span
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Features unique square shaped corners for a better edge-to-edge fit in standard cots
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Waterproof, washable
+
Higher number of pocket springs for maximum comfort
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Features 7 layers of comfort 
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Natural, breathable Tencel fabric keeps baby cool and dry
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Removable cover for washing
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Designed and made in Britain

Reasons to avoid

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A little pricey

The TrueFit™ Premium Mattress is Silver Cross' most luxurious cot bed mattress. It features a higher number of pocket springs (220 to be exact), distributing weight evenly and providing ergonomic comfort and optimal postural support for your growing baby.

The individual pocket springs actively respond to your baby's weight and shape over time, and make the mattress super comfortable, too.

Meanwhile moisture-wicking qualities provide a dry and cool micro-climate as your baby sleeps: There's a waterproof interior, anti-microbial and hypoallergenic properties, heat regulating fabrics and a temperature-regulating exterior with natural Tencel fabric to wick away moisture and promote airflow.

Exclusive to Silver Cross, the True Fit™ design also features unique square shaped corners for a better edge-to-edge fit in your standard cot bed.

Designed to grow with your child, the Premium Cotbed Mattress is fully reversible, providing firm support for infants aged 0-18 months and offering a softer side for toddlers and children aged 18 months and over.

What we like
The mattress gets its 'TrueFit' name from the square-shaped corners which minimise gaps between the cot bed and mattress, keeping little arms and legs safe.

We love that the mattress is reversible for older babies, thus extending the product's life. The design features a firmer sleep side for babies aged 0–18 months, while the softer side offers the best support and comfort for little ones aged 18 months and over.

The mattress feels super soft, padded and comfortable, with a temperature regulating quilted cover that feels fresh and cool