How to Choose a Cot Bed Mattress for Your Nursery
By Cuddleco | Published: 2026-10-24
Category: How-to Guides
Learn how to pick the right cot bed mattress for your baby's nursery, from firmness and materials to hypoallergenic features and spring types.
Quick answer
The best cot bed mattress for your nursery balances firmness, safety, and your baby's comfort needs. Focus on a firm, snug fit, and consider hypoallergenic materials or pocket springs for added support and allergen protection.
Firmness is non-negotiable for safe sleep
A firm mattress is essential to reduce the risk of Sudden Infant Death Syndrome (SIDS). When you press down on the mattress, it should spring back quickly without leaving an indentation. A mattress that is too soft can create a suffocation hazard, so always choose one that feels solid and supportive.
Size and fit matter more than you think
A standard cot bed mattress measures 140 x 70 cm, but always measure your cot before buying. The mattress should fit snugly with no more than a 2 cm gap on any side. A gap wider than that can trap your baby's limbs or head. If you have a smaller cot (120 x 60 cm), look for a mattress designed for that size.
Materials: foam, springs, and hypoallergenic options
Foam mattresses are lightweight and often more affordable, while spring mattresses (open coil or pocket sprung) offer better airflow and durability. Pocket sprung mattresses have individual springs that contour to your baby's movements, providing consistent support. Hypoallergenic materials like bamboo or TENCEL fibers can help reduce allergens, which is especially helpful if your family has a history of allergies or asthma.
Waterproof and breathable covers make life easier
Look for a mattress with a removable, washable cover. A waterproof layer protects the mattress from spills and accidents, while breathable fabrics help regulate temperature and prevent overheating. Some covers also feature anti-allergy treatments for extra peace of mind.
Your cot bed mattress decision checklist
- Measure your cot: Measure the internal width and length of your cot. Standard cot bed size is 140 x 70 cm, but smaller cots (120 x 60 cm) need a matching mattress.
- Check firmness: Press the mattress firmly. It should feel solid and spring back quickly. If your hand leaves an indentation, it is too soft for safe sleep. A firm mattress is the single most important safety feature.
- Choose spring type: Pocket sprung mattresses offer individual spring support that adapts to your baby's movements. Open coil springs are more budget-friendly but less contouring. Pocket springs are ideal if you want support that lasts through toddlerhood.
- Consider hypoallergenic features: If allergies run in the family, choose a mattress with anti-allergy treatments like Purotex or natural hypoallergenic materials such as bamboo or TENCEL.
- Look for a removable, washable cover: A waterproof, breathable cover that zips off makes cleaning easy and protects the mattress from accidents. This will save you time and keep the mattress fresh for years.
Products to consider
- Signature Hypo-Allergenic Bamboo Pocket Sprung Cot Bed Mattress 140 x 70cm: The Signature Sprung Cot Bed Mattress uses pocket springs that gently contour to your baby's changing position as they sleep. Pocket springs provide individual support, helping maintain spinal alignment and comfort as your baby grows and moves during the night.
Signature Hypo-Allergenic Bamboo Pocket Sprung Cot Bed Mattress 140 x 70cm - Mother&Baby First Gold Anti-Allergy Foam Cot Bed Mattress 140 x 70cm: The Mother&Baby First Gold Anti-Allergy Foam Cot Bed Mattress uses TENCEL fibers and Purotex technology for anti-allergy protection. If your baby has sensitive skin or you're concerned about allergens, this mattress actively reduces common triggers like dust mites and pet dander.
Mother&Baby First Gold Anti-Allergy Foam Cot Bed Mattress 140 x 70cm
Which mattress is right for you?
Best for
- Parents who want a supportive, long-lasting mattress with pocket springs
- Families with allergy concerns who need anti-allergy protection
Not for
- Parents on a very tight budget who need the most affordable option
- Those with a non-standard cot size who need a custom-fit mattress
