What Bedding Does My Baby Need in a UK Cot?
A baby in a UK cot needs three layers: a waterproof mattress protector, a fitted cot sheet and a baby sleeping bag.
- Mattress protector: the first layer, under the fitted sheet. It should be waterproof, sized to the cot mattress and lie flat with no raised edges.
- Fitted cot sheet: the only recommended bedding layer between the baby and the sleep surface. It needs a tight fit with no loose edges, and you should keep 3 in rotation.
- Baby sleeping bag: the recommended warm layer for babies under 12 months, in the correct tog for the season and compliant with BS EN 16781:2019.
UK safe cot bedding at a glance:
| Bedding Item | Age | Safe? | UK Authority | Notes |
|---|---|---|---|---|
| Waterproof mattress protector | All ages | ✅ Yes | The Lullaby Trust | Must lie flat, no raised edges |
| Fitted cot sheet | All ages | ✅ Yes | The Lullaby Trust | Tight fit; UK standard 140x70cm |
| Baby sleeping bag (correct size) | All ages | ✅ Yes | The Lullaby Trust / BS EN 16781:2019 | No neck gap; correct tog for season |
| Loose blanket | Under 12 months: ⚠️ NO | ⚠️ Not recommended | The Lullaby Trust | Risk of covering face; OK from approx. 12 months |
| Cot quilt / duvet | Under 12 months: ⚠️ NO | ⚠️ Not recommended | The Lullaby Trust | OK from approx. 12 months when baby moves freely |
| Padded cot bumper | Any age: ❌ NO | ❌ Not recommended | The Lullaby Trust | Suffocation and entrapment risk |
Loose blankets, quilts, duvets, pillows and padded bumpers are not recommended for babies under 12 months, according to The Lullaby Trust. From approximately 12 months, a light cot quilt is appropriate.
Boori baby sleeping bags are rated to BS EN 16781:2019, the UK safety standard for infant sleeping bags covering size, fastenings, and fire resistance. Sleeping bags, muslins and blankets are in the muslins, blankets and sleeping bags collection.
What Size Cot Bedding Do I Need for a UK Cot?
A standard UK cot bed needs bedding sized for a 140x70cm mattress, and a Boori compact cot needs bedding sized for a 119x65cm mattress.
Fitted sheets for standard UK cot beds are sized to 140x70cm, and compact cot sheets are sized to match the 119x65cm mattress. Always match the sheet exactly. A sheet that is too large will not stay flat, which is a loose-fabric safety risk, not just a matter of neatness. The Lullaby Trust advises that the fitted sheet must fit the cot mattress closely, with no bunching.
UK cot bedding sizes differ from US, European and Australian sizes, so only use sheets specified for UK cots. Sheets for each Boori cot size are in the cot and cot bed fitted sheets range.
How Many Cot Sheets Do I Need for a UK Baby?
You need a minimum of 3 fitted cot sheets for a UK baby, kept in rotation.
Keep a minimum of 3 fitted cot sheets in rotation, sheets may need changing 2–3 times overnight in the newborn stage after nappy leaks or possetting. Keep 3 folded beside the cot for 3am changes. The newborn stage is roughly 0–3 months. A waterproof mattress protector under each sheet protects the mattress and extends its life. Once your baby is sleeping through, typically at 3–6 months, 2 sheets may be enough, with a third kept as a backup.
Is It Safe to Use a Blanket or Quilt in a UK Baby's Cot?
It is not safe to use a loose blanket or quilt in a UK baby's cot for babies under 12 months, but a light cot quilt or blanket becomes appropriate from approximately 12 months.
For babies under 12 months, The Lullaby Trust advises against loose blankets, quilts, duvets and padded bumpers, because they increase the risk of overheating and accidental face covering. Use a baby sleeping bag rated to BS EN 16781:2019, sized to fit with no neck gap. From approximately 12 months, when your baby can move freely in the cot, a light cot quilt becomes appropriate. Before 12 months, stick to a fitted sheet and a sleeping bag. For full UK safe sleep guidance, visit lullabytrust.org.uk.
How Do I Wash Baby Cot Sheets?
Wash baby cot sheets at 40–60°C with a gentle detergent, and avoid fabric softener.
Wash cot fitted sheets at 40–60°C with a gentle detergent. Avoid fabric softener on fitted sheets, it can reduce fabric grip, causing corners to loosen. Tumble dry on low or line dry. Air-dry fully before use. Wash new sheets before their first use, and follow the care label on each product.
Changing time is easier with everything close to hand. Change tables, change mats and storage for nappies and spare sheets are in the baby changing collection.