Quick answer
For most babies, a firm, breathable fibre mattress that fits your cot or cot bed with no gaps is the safest and most comfortable choice. Look for a removable, washable cover to keep the sleep surface hygienic.
Why firmness and breathability matter
A firm sleep surface reduces the risk of suffocation and supports your baby’s developing spine. Soft mattresses can create a dip that may block airflow, so always press the centre and edges to check for firmness.
Breathable materials help regulate temperature and reduce overheating, which is linked to safer sleep. Fibre cores are naturally breathable, while foam can trap heat unless it has special airflow channels.
Fibre vs foam: what’s the difference?
Fibre mattresses use a supportive fibre core that is breathable and hypoallergenic, making them a good choice for babies with allergies or sensitive skin. They tend to be lighter and easier to lift when changing sheets.
Foam mattresses are often cheaper and provide good support, but they can be less breathable and may retain heat. Some foams are also less durable and may develop a permanent dip over time.
Your choice depends on your budget, your baby’s sleep temperature, and whether allergies are a concern. If you’re unsure, a fibre mattress is a safe, versatile option for most families.
Hygiene and maintenance
Babies are messy, so a removable, washable cover is a must. Look for a cover that can be washed at high temperatures to kill germs and remove stains easily.
A waterproof layer or a separate mattress protector can also help keep the mattress clean and extend its life. Check the care label before buying to ensure the cover is easy to remove and replace.
Decision rules for choosing a baby mattress
- Check the fit: Measure your cot or cot bed interior and choose a mattress that fits snugly with no gaps wider than two fingers at the sides or ends. A gap can trap an arm or leg and increase the risk of injury.
- Press for firmness: Press the centre and edges of the mattress. It should spring back quickly and not sag under your hand. A firm mattress supports your baby’s spine and reduces suffocation risk.
- Prioritise breathability: Choose a mattress with a breathable core, such as fibre, to help regulate temperature and reduce overheating. If you choose foam, look for one with airflow channels or a breathable cover.
- Check the cover: Look for a removable, washable cover that can be cleaned at high temperatures. This makes it easier to keep the sleep surface hygienic and free from allergens.
- Consider allergies: If your baby has allergies or sensitive skin, choose a hypoallergenic mattress. Fibre mattresses are often naturally hypoallergenic, while some foams may contain chemicals that can irritate.
- Think about long-term use: If you’re buying for a cot bed that will convert to a toddler bed, check the mattress size and whether it will still fit after conversion. A 70x140cm mattress is a common cot bed size. Before you buy, measure your cot or cot bed and note the exact dimensions you need.
Fibre mattresses we recommend
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Tutti Bambini Eco Fibre Deluxe Cot Bed Mattress 70x140cm: The Tutti Bambini Eco Fibre Deluxe Cot Bed Mattress has a breathable structure that supports airflow and a removable cover washable at high temperatures. This helps maintain a comfortable sleep temperature and makes cleaning up spills or accidents much easier.
Tutti Bambini Eco Fibre Deluxe Cot Bed Mattress 70x140cm
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Ickle Bubba Fibre Cot Bed Mattress 140x70cm: The Ickle Bubba Fibre Cot Bed Mattress has a supportive fibre core and is described as breathable and hypoallergenic. It’s a good option if your baby has allergies or you want a mattress that stays cool and comfortable through the night.
Ickle Bubba Fibre Cot Bed Mattress 140x70cm
Who this guide is for
Best for
- Parents buying their first cot or cot bed mattress
- Parents who want a breathable, hypoallergenic sleep surface
- Families looking for an easy-to-clean mattress with a washable cover
Not for
- Parents who need a mattress for a toddler bed (check size and firmness requirements separately)
- Those who prefer a memory foam feel, which is not recommended for babies under 12 months
