What bedding does a baby need?
Short answer: Just a firm, flat, waterproof mattress and lightweight bedding: fitted sheets plus either a well-fitted sleeping bag or firmly tucked-in lightweight blankets.
Here is the detail behind that answer, taken from current UK guidance from the NHS and the Lullaby Trust.
Things to check
- Match the sheet size to the mattress (for example 120 x 60cm or 140 x 70cm).
- Fitted sheets should sit tight and flat, with no loose fabric.
- Buy at least two or three for night-time changes.
What the guidance says
- The Lullaby Trust says a baby needs just two items in their cot: a firm, flat, waterproof mattress and lightweight bedding.
- A well-fitted baby sleeping bag is an alternative to blankets. Most makers base suitability on weight (usually around 4kg) rather than age, so check the label.
- If you use sheets and blankets, tuck them in firmly no higher than shoulder height. One blanket doubled over counts as two.
Related questions
What is a cot sheet?
A fitted sheet sized to the cot mattress.
Shop at Baby Kingdom
- Essentials Crib Fitted Sheets 2pk
- Cot Fitted Sheets 2pk
- Cot Fitted Sheets 2pk
- Muslin Fitted Sheet 140cm x 70cm - Berry Stripe
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
Can a 6 month old sleep with a blanket?Can a baby sleep with a blanket?What swaddles & blankets does Baby Kingdom sell?Can a 6 week old sleep with a blanket?Sleeping bag or blankets: which suits your baby?Guide to baby bedding: what to look forAll baby bedding and sleeping bags advice →
Sources
- The Lullaby Trust: Safer sleep advice (accessed 2026-10-21)
- 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.