When preparing for the arrival of your little one, there’s a lot to think about—from tiny clothes and nappies to pushchairs and car seats. But one of the most important items you’ll need is a cot mattress. It might not be the most exciting purchase, but it’s certainly one of the most essential. Your baby will sleep for many hours in their cot in those first months and years, so having the right mattress is important.
Here in this guide, we will take you through the most important things to look for when selecting a cot mattress, so you can make an informed, confident choice that is good for your baby's comfort and development.
1. Safety First
Safety of your baby is always at the forefront, and the mattress has an important part to play in the creation of a safe sleep space. The mattress should be flat, firm, and supportive to work against sudden infant death syndrome (SIDS).
The myth that soft and squishy must mean comfortable. Babies actually require a firmer surface to help keep their tiny bodies well-supported, and so they don't sink in. Always ensure that the mattress conforms to the British safety standard BS EN 16890:2017 for cot mattresses, ensuring it's safe for infant use.
You must also ensure the mattress is tightly fitted within the cot, with no gap larger than 3cm around the sides. A bigger gap can be unsafe if your baby rolls or squirms into it.
2. Materials of Cot Mattresses
Cot mattresses are available in different materials like different levels of support, breathability, and ease of cleaning. The most common ones are as follows:
Foam Mattresses
These are light, inexpensive, and usually appropriate for newborns. Choose high-density foam that provides good support and recovers quickly. Some foam mattresses now have breathable layers or ventilation holes to improve airflow.
Sprung Mattresses
Sprung mattresses are like adult mattresses, with coiled springs that spread weight evenly. They provide great support and longevity, and are a favorite for long-term use.
Pocket Sprung Mattresses
A high-end version of the sprung mattress, pocket-sprung mattresses have separate springs that move independently to your baby's movement. This kind provides better support, particularly as your child becomes heavier.
Natural Fibre Mattresses
Constructed of fabrics such as coir (coconut husk fibres), wool, or natural latex, these mattresses are chemical-free and breathable. They're usually more hypoallergenic and environmentally friendly but costlier.
Dual-Sided Mattresses
Some mattresses have two sides—one firmer for newborns, and the other slightly softer for toddlers. These can be a cost-effective and practical option if you’re planning to use the same mattress as your baby grows.
3. Breathability and Temperature Regulation
Overheating is another culprit associated with SIDS, so picking a mattress that encourages breathability can help a lot. Keep an eye out for mattresses with breathable covers, ventilated cores, or mesh panels. Wool and natural latex are excellent temperature-regulating and moisture-wicking materials.
You can also purchase breathable mattress protectors to augment airflow without sacrificing hygiene.
4. Ease of Cleaning
Let's be real—babies are sloppy. Whether leaky nappies, spills, or reflux are the culprits, your cot mattress will have its share of accidents. That is why it makes sense to choose a mattress that has a washable, removable cover or is waterproof.
There are some mattresses that are completely waterproof with wipe-clean surfaces, but others have machine-washable covers that zip off. Quick and easy cleanliness is not merely a matter of convenience—it's also good for your baby's health and hygiene.
5. Size and Fit
Not all cots are the same size, so double-check the dimensions before purchasing a mattress. The majority of UK cots fit a standard-sized mattress (usually 60cm x 120cm), but cot beds require something larger (usually 70cm x 140cm). Always check your cot and use the manufacturer's guidelines to get the correct fit.
Keep in mind: a mattress that is too small will leave gaps, and one that is too big will not lie flat—both are dangerous.
6. Allergies and Sensitivities
If your baby has sensitive skin or allergies, consider hypoallergenic mattresses. These mattresses are designed to resist the accumulation of dust mites, mould, and bacteria that can be asthma or allergy triggers. Some mattresses also have anti-allergy coatings or natural microbial-resistant materials.
For reassurance, choose materials that are certified by OEKO-TEX® or CertiPUR, ensuring that no dangerous chemicals have been used in their production.
7. How Long Will It Last?
Some parents ask whether it's possible to reuse a mattress for a second child. The Lullaby Trust advises that a new mattress be used for each baby wherever possible, particularly if the previous one is worn out or sags. If you need to reuse a mattress, it should be clean, well maintained, and a good fit for the cot.
Some higher-end mattresses can last for years and come with multi-stage support, making them suitable from birth to toddlerhood. If you’re buying a cot bed (which converts into a toddler bed), investing in a longer-lasting mattress might make sense.
8. Budget Considerations
There is a broad price spectrum when it comes to cot mattresses, ranging from cheap foam mattresses to expensive organic ones. As much as you might want to cut costs wherever possible, don't skimp on safety and comfort. Even a cheaper mattress can be great if it is safe and suitable for your needs.
Think of it as an investment in your baby's sleep and brain development. A rested baby tends to be a happier baby—and a rested parent is priceless.
9. Try Before You Buy (If You Can)
Though convenient, it's worth going into a baby store to actually see and feel the various types of mattresses before making a decision. You can roll them over to check how firm they are, look at the materials, and ask questions about maintenance and durability.
Even if you do end up buying online, that little added bit of hands-on investigation can be comforting.
Final Thoughts
Selecting the ideal cot mattress is daunting when there are so many options available, yet paying attention to safety, support, size, and hygiene will make choosing significantly easier. Trust your instincts, read reviews online, and don't hesitate to ask for recommendations in-store or from other parents.
No matter if you choose foam, sprung, or natural fibre, what's most important is that your baby sleeps soundly and safely. A quality baby cot mattress lays the foundation for peaceful nights—for your baby and for you.