Cot mattresses buying guide for UK parents
Short answer: A cot mattress is a firm, flat mattress for a standard cot, usually 120 x 60cm. Choose one that fits your space and your baby's stage, and use it as the instructions say.
What is a cot mattress?
A firm, flat mattress for a standard cot, usually 120 x 60cm. It is used from birth for as long as your child sleeps in the cot.
How to choose
- Measure the inside of the cot. The mattress should fit with no gaps.
- Choose firm, flat and waterproof. Your baby's head should sink no more than a few millimetres.
- Check for a fire-resistant label and the relevant British Standard.
Safety standards
- Mattresses: look for BS 7177:2008+A1:2011, and BS EN 16890:2017+A1:2021 for cot, travel cot and crib mattresses.
Common questions
- Should a cot mattress be firm or soft?
- Can I use a second-hand cot mattress?
- Do I need a waterproof mattress protector for a cot?
- How do I check a cot mattress fits?
- What size is a cot mattress?
- Is a sheepskin safe in a cot?
- Should I buy a sprung or foam cot mattress?
- How do I clean a cot mattress?
What the guidance says
- Use a firm, flat, waterproof mattress in good condition, with no raised or cushioned edges, that fits the cot or Moses basket with no gaps.
- The Lullaby Trust says your baby's head should sink no more than a few millimetres into the mattress.
- The Lullaby Trust recommends a new mattress for each baby where possible. A second-hand one should have a 100% waterproof cover, no rips, tears or water damage, no sagging, a good fit and a fire-resistant label.
- Mattresses: look for BS 7177:2008+A1:2011, and BS EN 16890:2017+A1:2021 for cot, travel cot and crib mattresses.
Shop at Baby Kingdom
Browse cot mattresses 120 x 60
- Tutti Bambini Sprung Cot/Cot Bed Mattress
- Obaby Sprung Mattress - 120 x 60cm
- Ickle Bubba Premium Sprung Cot Mattress
- Tutti Bambini Pocket Sprung Cot Mattress (60 x 120 cm)
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
What space saver cot mattresses 100 x 50 does Baby Kingdom sell?When should I buy a travel cot mattress?Can a 10 month old sleep on a raised or tilted mattress for reflux?Travel cot mattress vs cot mattress: which is better?Does my baby need a mattress topper?Do I need a new mattress for my second baby?All cot and baby mattresses advice →
Sources
- The Lullaby Trust: Baby mattresses and bedding (accessed 2026-10-21)
General information only, not medical advice. Always follow your product's instructions. If you are worried about your baby, contact your GP, health visitor or 111. In an emergency, call 999.