Simba Hybrid Cot Bed Mattress Review
A double-sided cot bed mattress with a water-resistant core, addressing the two things that actually matter: firmness for safe sleep, and surviving what a baby does to it.
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Verdict
A double-sided cot bed mattress with a water-resistant core, which addresses the two things that actually matter for an infant mattress: firmness for safe sleep, and surviving what a baby does to it. At 249 pounds it is expensive and it is also the right kind of expensive.
Buy it if
You want a properly engineered cot bed mattress that will survive several years and multiple children.
Avoid it if
Budget is tight and the cot bed will be used briefly. A cheaper mattress meeting the same safety standards is a reasonable choice.
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| Specification | Detail |
|---|---|
| Type | Double-sided cot bed mattress |
| Core | Water-resistant |
| Sides | Two, for different stages |
| Price from | £249 |
| Size | Cot bed |
The scores
Properly designed for a category where most products are an afterthought.
Two hundred and forty-nine pounds is a lot. It is also a mattress that survives several years.
Firm, which is what infant safe sleep guidance requires. This is not a comfort preference.
Breathable construction, which matters more for an infant than for an adult.
Relevant in a cot, where the mattress must sit flush to the frame.
Largely irrelevant at this size.
Simba's standard terms, which most nursery brands do not match.
Firm is a safety requirement, not a preference
Infant sleep safety
For babies, a firm, flat mattress is safer sleep guidance rather than a comfort choice. Soft surfaces and gaps between mattress and cot frame are recognised risk factors. The Lullaby Trust is the authoritative UK source on safer infant sleep and is worth reading before you buy anything for a cot.
Two practical checks that matter more than any brand. The mattress must fit the cot with no gap you could fit two fingers into. And it must be firm enough that it does not indent under the baby's head.
That is why the support score here is a 9 and why I would not recommend a plush infant mattress at any price. In this one category, firm is not a preference at all.
The water-resistant core is the practical part
Everything that happens to a cot mattress is a liquid. Nappies leak, babies are sick, and toddlers are toilet training.
A water-resistant core means those events are a cleaning job rather than a replacement. On a mattress used for two or three years, across possibly more than one child, that is the difference between 249 pounds being expensive and being cheap per year.
Use a separate waterproof protector as well. The core protects the mattress; the protector protects your evening.
Double-sided, and why that is useful
Two sides usually means a firmer infant side and a slightly more forgiving toddler side. As the child grows and the safe sleep requirements relax, you flip rather than replace.
That is a genuine feature rather than a marketing one, because it extends the useful life of the mattress across the exact period when a child's needs change most.
A correction worth making
Commonly repeated, and wrong
Cot and nursery mattresses are often reviewed using the same comfort criteria as adult mattresses, with softness treated as a benefit. For infants the opposite applies: safer sleep guidance calls for a firm, flat surface with no gap between mattress and cot frame, and softness is a recognised risk factor rather than a feature. Any review recommending a plush infant mattress is applying the wrong criteria entirely.
Should you buy it?
Yes if you want a cot bed mattress engineered for the job and you will use it for several years or more than one child. The water-resistant core and the two sides both earn their place.
If budget is tight, a cheaper mattress that meets the same safety standards and fits the cot properly is a perfectly responsible choice. Fit and firmness matter far more than brand.
Questions people ask
Should a baby mattress be firm?
Yes, and it is a safety matter rather than a comfort preference. Safer sleep guidance calls for a firm, flat surface, and soft surfaces are a recognised risk factor. The Lullaby Trust is the authoritative UK source and worth reading before buying anything for a cot.
What matters most when buying a cot mattress?
Fit and firmness, ahead of brand. The mattress must fit the cot with no gap you could fit two fingers into, and it must be firm enough not to indent under the baby's head. A water-resistant core matters practically, because everything that happens to a cot mattress is a liquid.