Silentnight Healthy Growth Astro Eco Comfort Pocket Kids Mattress
The Silentnight Healthy Growth Astro is a hybrid kids' mattress built around 600 Mirapocket® springs, which means your child gets support that adjusts to their body rather than a flat, one-note surface.
- Free from foam & chemical treatments
- Zoned springs that follow their shape
- 60-night trial & 5-year guarantee
£259
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The Silentnight Healthy Growth Astro is rated Medium, a sensible middle ground for growing sleepers, and the EcoComfort Fibres™ comfort layer is designed to keep things breathable. It's free from foam and FR chemical treatments, and hypoallergenic too, which will reassure parents wary of what goes into a child's bed. It comes in UK Single, Small Double and Double. At 23.5cm deep, it's a proper full-height mattress rather than a thin children's pad.
Mattress specifications
Firmness
Medium
Type
Hybrid
Depth (cm)
24
Number of Layers
3
Trial Period (nights)
60
Warranty (years)
5
Price Range
£259 to £329
Best Sleeping Position(s)
Side Sleeping
Back Sleeping
Combination Sleeping
Certifications
Assessed from Silentnight's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The strongest argument for this mattress is what Silentnight has left out. There's no foam and no FR chemical treatment, so if you'd rather avoid synthetic foams in your child's bed, this is one of the more straightforward routes to that. The 600 pocket springs offer zoned support that Silentnight says is scientifically proven to improve spinal alignment and posture, a genuine consideration while a child is still growing. You also get a 60-night trial and a 5-year guarantee from Silentnight, with delivery in 14 days. Yes, the starting price is a fair sum for a kids' mattress, but you're paying for pocket springs and a chemical-free build rather than a basic open coil.
Key features & layer details
Sleep surface
A breathable quilted sleep surface, which means the top of the mattress lets air move through rather than trapping warmth. It's a simple layer doing a simple job.
Support system
600 Mirapocket® springs providing zoned support, which Silentnight says is scientifically proven to improve spinal alignment and posture. Each spring moves independently, so support follows your child's shape as they shift about.
Comfort layer
Breathable EcoComfort Fibres™ sit in the comfort layer for cooler sleep. This is where the mattress gets its softness without using any foam.
Layer details from silentnight.co.uk product page, September 2026.
Best suited for?
Children
The Medium feel, pocket springs and full-height build make this a proper children's mattress, with support that follows your child's shape as they shift about.
Allergy sufferers
Hypoallergenic fibres and a build free from foam and FR chemical treatments make it a reassuring choice for anyone wary of what goes into a bed.
Warm sleepers
A breathable quilted sleep surface and EcoComfort Fibres in the comfort layer let air move through, which helps keep sleep cooler.
Eco-conscious buyers
With no foam and no FR chemical treatment used anywhere in the build, this is a straightforward route for parents who want to avoid synthetic materials.
Combination sleepers
Each of the 600 Mirapocket springs moves independently, so support adjusts as a child changes position through the night.
If your child strongly prefers a soft, sink-in feel, the Medium rating and fibre comfort layer may feel a little firm to them. And if you're shopping on a tight budget, the starting price is more than many basic kids' mattresses, so weigh up whether the spring and chemical-free build matter to you.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Silentnight Healthy Growth Astro Eco Comfort Pocket Kids Mattress
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FAQ's
How firm is the Silentnight Healthy Growth Astro mattress?
Silentnight rates it as Medium. That's a balanced feel that suits most children, offering enough give for comfort while the 600 pocket springs keep the spine supported. It shouldn't feel hard, but it isn't a plush, sink-in mattress either.
Does the Silentnight Astro kids mattress contain foam?
No. It's certified free from foam and FR chemical treatments, using EcoComfort Fibres™ in the comfort layer instead. It's also hypoallergenic, which helps if your child has allergies or sensitive skin.
What trial and guarantee comes with the Silentnight Healthy Growth Astro?
Silentnight offers a 60-night trial, so your child has two months to settle in before you're committed. There's also a 5-year guarantee covering manufacturing faults, and delivery takes 14 days.
What sizes does the Silentnight Healthy Growth Astro come in?
Three sizes: UK Single, UK Small Double and UK Double. Every size is 23.5cm deep.
How many springs does the Silentnight Healthy Growth Astro have?
It has 600 Mirapocket® springs. These are pocket springs, meaning each one moves independently to give zoned support across the mattress, rather than the whole surface flexing together as it would with an open coil design.
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