Moses basket mattress vs cot mattress: which is better?
Short answer: They do different jobs. A Moses basket mattress is a slim mattress made to fit a crib or Moses basket exactly. A cot mattress is a firm, flat mattress for a standard cot, usually 120 x 60cm. Choose by your baby's stage, your space and how long you want to use it.
Moses basket mattress
Used for as long as your baby uses the crib or basket.
- Measure the basket or crib base. A snug fit with no gaps matters most.
- Firm, flat and waterproof.
- Replace it if it sags, tears or gets water-damaged.
Cot mattress
Used from birth for as long as your child sleeps in the cot.
- 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.
| Moses basket mattress | Cot mattress | |
|---|---|---|
| Typical use | for as long as your baby uses the crib or basket | from birth for as long as your child sleeps in the cot |
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 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.
- The Lullaby Trust says your baby's head should sink no more than a few millimetres into the mattress.
- Mattresses: look for BS 7177:2008+A1:2011, and BS EN 16890:2017+A1:2021 for cot, travel cot and crib mattresses.
Related questions
How long can you use a Moses basket mattress?
For as long as your baby uses the crib or basket.
How long can you use a cot mattress?
From birth for as long as your child sleeps in the cot.
Shop at Baby Kingdom
Browse crib & moses basket mattresses
- Ickle Bubba Drift Gliding Crib Mattress Complete
- Ickle Bubba Bubba&Me Luxe Mattress Complete
- Tutti Bambini CoZee Polyester Fibre Mattress
- Ickle Bubba Nova Moses Basket Complete Mattress
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
Can I buy a second-hand cot mattress?What size is a cot bed mattress?How do I choose a cot mattress?Guide to cot mattresses: what to look forCot bed mattresses buying guide for UK parentsTravel cot mattresses buying guide for UK parentsAll 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.