Best Kids Mattress Australia: How to Choose for Your Child

Kids mattresses get tested by spills, illness, toilet training, jumping, growth spurts, and a thousand bedtime negotiations. The right mattress balances firmness for growing spines, easy hygiene for nighttime accidents, and a size that matches your child's age and how fast they're growing. This guide walks through what actually matters when choosing — and shows where our two kids mattresses fit: the Joey Kids Mattress and the Koala x Bluey Snoozytime Mattress. For the broader bed transition story — cot to toddler bed to single bed — our toddler bed guide covers that side in depth.

How do you choose the best kids mattress in Australia? Focus on five things: (1) firmness — Red Nose and AS/NZS 8811.1 require a firm sleep surface for young children, (2) size matched to age — cot mattress (around 132 × 70 cm) for infants in a cot, then a toddler/junior or Standard Single (92 × 188 cm) once they move to a toddler or single bed, and King Single (106 × 203 cm) for taller kids, (3) water-resistant or machine-washable cover — non-negotiable through toilet training and beyond, (4) third-party certifications — CertiPUR-US® for foam safety, OEKO-TEX® or Sensitive Choice for fabric and allergens, and (5) construction — hybrid (foam + pocket springs) suits growing spines better than pure foam for many kids. Avoid soft, plush, or "memory foam pillow-top" mattresses for under-5s.

Key Takeaways

• Kids mattresses need to be firm — per Red Nose Australia, a firm sleep surface is safest for young children; AS/NZS 8811.1 is the official Australian sleep-surface firmness standard

• Size matches age: cot mattress (around 132 × 70 cm) for infants in a cot, toddler/junior or Single mattress for toddler beds (frame-dependent), Standard Single (92 × 188 cm) from age 5–6, King Single (106 × 203 cm) for tall or fast-growing kids

• Hygiene is critical — look for water-resistant covers plus machine-washable toppers; toilet training, spills, and illness all make this non-negotiable

• Certifications worth trusting: CertiPUR-US® (foam safety), OEKO-TEX® Standard 100 (textile safety), AS/NZS 8811.1 (firmness), Sensitive Choice (allergens and asthma)

• Our Joey Kids Mattress (hybrid construction, water-resistant cover, machine-washable topper, ages 3–12) and Koala x Bluey Snoozytime Mattress (Bluey-themed sibling of the Joey) are both designed for Australian families and backed by our 120-day trial.

What to look for in a kids mattress

Five things drive the decision — get these right and the rest of the buying choice follows.

1. Firmness. Soft mattresses are unsafe for young children. A firm sleep surface reduces suffocation risk if a child rolls face-down and supports developing spines. Most kids mattresses sit at 7–8 on the standard 1–10 firmness scale.

2. Size. Matches your child's age and how fast they're growing. A standard Single mattress (92 × 188 cm) suits most kids from age 5–6; King Single (106 × 203 cm) gives more length for taller or fast-growing children.

3. Hygiene. Kids spill. Toilet training accidents are inevitable. Illness happens. A mattress with a water-resistant permanent layer and a machine-washable topper makes day-to-day life much easier — and protects the mattress core for years.

4. Certifications. Third-party verified safety and material standards. Look for CertiPUR-US® on foams, OEKO-TEX® or GOTS on textiles, AS/NZS 8811.1 on firmness, and Sensitive Choice (National Asthma Council Australia) on allergens and asthma-friendly products.

5. Construction. Hybrid (foam plus pocket springs) suits growing spines better than pure foam for many kids — better airflow, firmer support, longer durability. Pure foam works for younger ages and tighter budgets.

The next sections walk through each of these in detail.

Why firmness matters for kids — and what "firm" actually means

The safest mattress for a young child is a firm one. According to Red Nose Australia — Australia's national safe-sleep authority — soft mattresses increase suffocation risk if a small child rolls face-down. Firm sleep surfaces are the safe-sleep standard for infants and young children.

The official Australian standard for sleep-surface firmness is AS/NZS 8811.1:2013 — the test product manufacturers use to certify a mattress is firm enough for infant and young child sleep. Look for this standard explicitly mentioned in any kids mattress product spec.

On the standard 1–10 firmness scale, kids mattresses typically sit at 7–8. Important note: "firm" doesn't mean "rock-hard." A firm mattress can still feel comfortable — it just doesn't let the body sink into the surface. What you want to avoid for children:

• "Pillow-top" or "memory foam plush" mattresses

• Soft mattresses marketed for adults

• Old, sagging hand-me-down mattresses (no longer firm even if they once were)

• "Cushioned" or "ultra-soft" descriptors

A note on age-appropriate firmness: for very young children (under 2), firmness is a safety standard, not a preference. As kids grow into the 6–12 range, slightly softer comfort layers become acceptable — but the core should still be supportive and firm. The Australian Spinal Research Foundation generally recommends firm support for growing spines.

Mattress size by age — what fits when

Australian sleep products match different mattress sizes to different stages. Here's what fits when:

A few general practical notes:

• Cot mattresses are smaller than Single mattresses. A standard cot mattress is around 132 × 70 cm; a Standard Single is 92 × 188 cm. The transition from cot to toddler bed (or single bed) involves a different mattress size, not just a different frame.

• Toddler bed mattress size depends on the bed frame. Some toddler beds use a smaller toddler/junior mattress; others are sized for a Standard Single. Check the frame's specifications before buying the mattress.

• King Single is the under-rated long-term buy. It's only slightly wider than a Standard Single but 15 cm longer (203 cm vs 188 cm). For tall or fast-growing kids, this length matters a lot — a King Single can last from age 6 well into the teen years.

• Length, not width, is what catches parents out. Most parents buy on width and discover too late that their kid's feet hang off the end. Plan for length first.

For the bed-frame side of this decision (toddler bed vs single bed transition timing, safety rails, frame types), our toddler bed guide covers that in detail.

Hygiene, spills, and water-resistant covers

This is the section most review listicles gloss over — and the one parents care about most after the first toilet-training accident.

Real-life kids mattress hygiene scenarios:

• Toilet training accidents — most children experience nighttime accidents into ages 5–7, sometimes longer

• Illness — vomiting, fever sweats, runny noses

• Spilled drinks, food in bed, drawing materials

• General use — sweat, dust mites, skin cells building up over years

The right kids mattress addresses these with a two-layer hygiene system:

Layer 1: Water-resistant permanent layer (under the cover). This stops liquid from reaching the mattress core. Without this, one bedwetting episode can mean the entire mattress is compromised.

Layer 2: Zip-off, machine-washable topper. Direct hygiene — the part your child sleeps on can come off and go in the wash. Saves you from spot-cleaning the whole mattress and lets you keep the sleep surface genuinely clean.

A mattress protector (sold separately) adds a third layer for extra insurance, especially during toilet training or for kids with allergies.

Our Joey Kids Mattress has both built-in layers: a water-resistant protective layer protects the core, plus a zip-off topper made from 100% recycled polyester that machine-washes cold. The Koala x Bluey Snoozytime Mattress uses the same hygiene construction with a Bluey-themed cover.

Certifications worth looking for

Marketing language is cheap. Third-party certifications are the proof. Here's what to actually look for on a kids mattress:

CertiPUR-US®. Independent foam certification — tests for low VOCs, no ozone depleters, no PBDE flame retardants, no heavy metals, no formaldehyde, no prohibited phthalates. Kids spend more hours on their mattress than adults; foam safety matters more.

OEKO-TEX® Standard 100. Textile safety certification — tests fabrics and covers for harmful substances. The textile world's gold standard for material safety.

AS/NZS 8811.1:2013. The official Australian sleep-surface firmness standard. If a mattress is marketed for kids and doesn't reference this standard, ask why.

Sensitive Choice (National Asthma Council Australia). Established in 2006, Sensitive Choice identifies products suitable for people with allergies, asthma, or sensitive skin. Particularly important if your child has any respiratory or skin sensitivities. Several kids mattress brands (including Eco Kids) carry this endorsement.

GOTS (Global Organic Textile Standard). For mattress covers and toppers made from organic cotton — the certification that verifies "organic" claims.

FSC or PEFC. For wood-derived components (e.g., TENCEL™ Lyocell). Verifies sustainable forest sourcing.

A note on Australian Spinal Research Foundation (ASRF) endorsement: some kids mattresses (Eco Kids being the most notable) carry this. It's a credible third-party endorsement worth knowing about when comparing options.

Hybrid vs foam for kids

The construction decision usually comes down to hybrid (foam plus pocket springs) versus pure foam.

Hybrid construction (foam comfort layer + pocket spring support core)

• Better airflow — runs cooler, important for kids who sleep hot
• Firmer support — better for growing spines
• More responsive — easier for kids to move on
• Longer durability for active kids
• Slightly more expensive

Pure foam construction

• Quieter — no spring sounds
• More affordable
• Better motion isolation (if siblings share a room)
• Can run warm — important consideration in humid AU summers
• Comfort-layer quality varies hugely between brands

Latex mattresses for kids

• Naturally hypoallergenic
• Very durable (10+ years)
• Cooler-sleeping than memory foam
• Premium price point

What we use: Our Joey Kids Mattress uses hybrid construction — Kloudcell® open-cell foam comfort layer plus tempered steel pocket springs. This combination delivers firm spinal support while staying breathable, which suits Australian kids in hot summer climates.

For more on foam types and how they compare in detail, see our foam mattress guide.

When to upgrade your child's mattress

Signs it's time for a new kids mattress:

• Your child's feet hang off the end — they've outgrown the length (usually around age 5–7 in a 188 cm mattress)

• Visible sagging or body indentations — the mattress has lost its firmness

• Persistent odour that won't shift with cleaning — accumulated moisture damage in the core

• Allergy or asthma symptoms worsen at night — dust mite buildup in an aging mattress

• The mattress is older than 5–8 years — kids mattresses wear faster than adult ones due to active use

This is separate from the bed upgrade decision. Many parents move their child from a toddler bed to a single bed before needing a new mattress (since the dimensions are the same). Other times the mattress wears out before the bed does. For the bed-side of the transition, see our toddler bed guide. For broader mattress lifespan guidance across the family, see our how long does a mattress last guide.

Koala's kids mattress range

We make two kids mattresses, designed for ages 3–12.

Joey Kids Mattress — our headline kids mattress.

• Hybrid construction (Kloudcell® open-cell foam + tempered steel pocket springs)
• Water-resistant protective layer over the core
• Zip-off, machine-washable topper (100% recycled polyester)
• Standard single size (92 × 188 × 15 cm)
• 120-day trial

Koala x Bluey Snoozytime Mattress — the Bluey-themed sibling.

• Pure Kloudcell® open-cell foam construction (no pocket springs — different from the Joey)
• Same hygiene features as the Joey (water-resistant inner layer + machine-washable topper)
• Bluey-themed removable cover
• Limited edition collaboration with Ludo Studio (Bluey's creators)
• A unique pick for kids who love Bluey

For the King Single upgrade — when your child outgrows a single — our adult Koala SE Mattress is available in King Single and works as the next-step mattress for older kids and pre-teens.

If your child has specific health considerations — like asthma, allergies, or spinal alignment concerns — it's worth looking for kids mattresses that carry endorsements from the Australian Spinal Research Foundation or Sensitive Choice (the National Asthma Council Australia's program for allergy- and asthma-friendly products). These third-party endorsements help families identify products tailored to those specific health needs. For all our kids mattresses, we use CertiPUR-US® certified foams and back every purchase with our 120-day trial.

Time for a kids mattress built for real life?

Whether you're after the hybrid Joey Kids Mattress with water-resistant cover and machine-washable topper, or the Bluey-themed Koala x Bluey Snoozytime Mattress, our kids range is built for spills, jumping, and growing bodies — backed by our 120-day trial.

Shop Koala's kids range →