When should I buy a Moses basket mattress?
Short answer: Buy in time for when you will first use it: for as long as your baby uses the crib or basket. For newborn essentials, many parents order in the second trimester to allow for delivery and assembly.
- 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.
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.
Related questions
What is a Moses basket mattress?
A slim mattress made to fit a crib or Moses basket exactly.
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Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
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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.