Best-of buying guide
Best Cot Mattresses UK (2026)
By Hannah Wright · Reviews Editor
Prices & availability last checked 28 July 2026
At a glance
| Pick | Score | Best for | Standard | Size | Price |
|---|---|---|---|---|---|
| SnuzSurface Plus | 9.4/10 | Best overall | BS EN 16890 | 120 × 60cm | From £89 |
| Mamas & Papas Breathable Cot Mattress | 9.2/10 | Best value | BS EN 16890 | 120 × 60cm / 140 × 70cm | From £59 |
| The Little Green Sheep Organic Cot Mattress | 9/10 | Best organic | BS EN 16890 | 120 × 60cm / 140 × 70cm | From £119 |
| Tutti Bambini Pocket Sprung Cot Mattress | 8.7/10 | Best pocket sprung | BS EN 16890 | 120 × 60cm / 140 × 70cm | From £69.99 |
| John Lewis ANYDAY Cot Mattress | 8.4/10 | Best budget | BS EN 16890 | 120 × 60cm | From £35 |
The mattress is the most safety-critical item in the cot. The Lullaby Trust is clear: it must be firm, flat, and fit the cot with no gaps at the edges — a hand should not slide between mattress and cot side. Soft, memory-foam or pillow-top cot mattresses are not safer-sleep compliant, whatever the marketing says.
Standards that matter
- BS EN 16890 is the current European safety standard for cot mattresses — look for it on the label.
- BS 1877-10 covers domestic mattress flammability and includes firmness requirements for cot mattresses. A compliant mattress resists indenting when your baby is placed on it.
- Exact fit. Standard UK cot mattresses are 120 × 60cm; cot beds use 140 × 70cm. Always measure your cot internal dimensions before buying — "standard" is not universal.
- Waterproof cover. A removable, washable waterproof cover protects the core from nappy leaks and night sweats. Check whether it is included or sold separately.
Materials — what the evidence says
Sprung, pocket-sprung, coir and foam mattresses can all be safe if firm enough. "Breathable" marketing is not a safer-sleep substitute for a clear cot with no loose bedding. The NHS recommends a fitted sheet only — no mattress toppers, nests or positioners.
Our picks, in detail
Best overall
1.SnuzSurface Plus
From £89
9.4 /10
Snuz's own-brand mattress designed for the SnuzKot but fitting any standard 120 × 60cm cot — a firm pocket-spring core, breathable cover and the right balance of support and airflow. The default recommendation in UK nursery Facebook groups for good reason.
Pros
- +Firm pocket-spring core meets safer-sleep firmness guidance
- +Breathable, removable and washable cover included
- +Designed to BS EN 16890 — clearly labelled
Cons
- –Standard cot size only — check dimensions for cot beds
- –Premium price against basic foam alternatives
Best value
2.Mamas & Papas Breathable Cot Mattress
From £59
9.2 /10
Mamas & Papas's mid-range cot mattress delivers BS EN 16890 compliance, a firm sprung core and a breathable cover at a price that undercuts premium rivals. Widely stocked and easy to replace when the nappy-leak damage accumulates.
Pros
- +Firm sprung core at a sensible mid-range price
- +Breathable cover with waterproof inner layer
- +Available in standard and cot-bed sizes
Cons
- –Cover is functional rather than organic or premium-feel
- –Heavier than all-foam budget mattresses
Best organic
3.The Little Green Sheep Organic Cot Mattress
From £119
9 /10
A British brand's organic cot mattress with a coir and wool core — naturally firm, breathable and free from chemical fire retardants. The premium pick for parents who want organic materials without compromising on the firmness safer-sleep requires.
Pros
- +Organic coir and wool core — firm without foam
- +No chemical fire retardants — uses wool's natural properties
- +Removable organic cotton cover, machine washable
Cons
- –Premium price — often double basic foam mattresses
- –Heavier and thicker — check cot depth compatibility
Best pocket sprung
4.Tutti Bambini Pocket Sprung Cot Mattress
From £69.99
8.7 /10
Tutti Bambini's pocket-sprung cot mattress offers individual spring zones for even firmness across the surface — a detail that matters when babies move to the edges. Fits standard and cot-bed sizes with a waterproof cover included.
Pros
- +Individual pocket springs for even firmness edge to edge
- +Waterproof cover included in the price
- +Both standard and cot-bed sizes available
Cons
- –Sprung mattresses are heavier to lift for sheet changes
- –Brand less widely known than Mamas & Papas or Snuz
Best budget
5.John Lewis ANYDAY Cot Mattress
From £35
8.4 /10
John Lewis's own-brand foam cot mattress meets BS EN 16890 at the lowest price from a trusted UK retailer — firm enough for safer sleep, with a wipe-clean cover. Not the most breathable or luxurious, but compliant and honest for tight budgets.
Pros
- +BS EN 16890 compliant at a genuine budget price
- +Firm foam core suitable for newborn sleep
- +Easy to buy in-store for same-day collection
Cons
- –Basic foam — less breathable than sprung or coir rivals
- –Cover feels functional rather than premium
How we chose
We build every shortlist the same way: we map the whole UK market for the category, weight the specifications that change daily life (not the ones that look good in adverts), cross-reference sustained buyer feedback across multiple retailers, and sanity-check prices across the retailers we link. Retailers cannot pay to appear, and commission never affects rankings. Prices were verified on the "last reviewed" date and will drift — always confirm on the retailer page.
Buy-safe check: nursery & travel accessories
UK standard: General Product Safety Regulations 2005. Accessories without a dedicated standard (footmuffs, changing bags, pram accessories) still legally require safety under the GPSR, including a traceable UK/EU responsible person.
- ✓ A named brand with a UK or EU contact address — anonymous imports have no one accountable
- ✓ Footmuffs: the pushchair harness passes through and fastens over the child, never under the muff
- ✓ No loose cords, detachable small parts or unbranded electrics
Check live UK recalls before buying: gov.uk product recalls & alerts · Read our guide to dangerous baby products sold online .
Still deciding? Compare two
Your questions, answered
How firm should a cot mattress be?
Firm enough that it does not indent when your baby is placed on it — the Lullaby Trust "hand test" is a useful guide. Avoid memory foam, pillow-top or soft mattresses for babies under 12 months. BS 1877-10 includes firmness requirements for compliant cot mattresses.
What size cot mattress do I need in the UK?
Most standard cots take 120 × 60cm. Cot beds typically need 140 × 70cm. Always measure your cot's internal base before buying — gaps between mattress and cot sides are a safer-sleep hazard.
Can I reuse a cot mattress for a second baby?
The Lullaby Trust advises using a new mattress for each baby where possible, because the core may have mould or bacteria from the first child's nappy leaks. If reusing, inspect for sagging, staining or damage — replace if the surface is no longer firm and flat.
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