Children spend more time asleep than adults — they need more sleep for growth, development, and cognitive function. Yet kids' mattresses are often an afterthought, with many parents defaulting to the cheapest option available. The truth is that a quality mattress that properly supports a growing body matters more for children than it might for adults, who aren't actively developing.
This guide covers what to look for in a mattress for children in Australia, the right size and firmness considerations by age, and the best options currently available.
Why the Right Mattress Matters for Children
Children's spines, hips, and shoulders are still developing. A mattress that doesn't provide proper support during this period can contribute to poor posture habits and musculoskeletal development issues. Children also sleep in more varied positions — they tend to move more than adults and often sleep in unusual postures — which means their mattress needs to accommodate different positions well.
Additionally, children are more sensitive to chemicals and off-gassing from mattress materials. Certifications like CertiPUR-US or OEKO-TEX are more important for children's mattresses than for adults.
Firmness for Children
Babies and Toddlers (0–3 years)
Cot and toddler mattresses should be firm — this is a safety requirement as much as a comfort one. Soft mattresses pose a suffocation risk for infants and very young children. Always choose a firm, flat cot mattress that fits snugly in the cot with no gaps.
Primary School Age (4–12 years)
Children in this age range do well on a medium to medium-firm mattress. Their bodies are lighter than adults, so they don't need as much pushback to maintain alignment, but a mattress that's too soft can affect posture. A medium is generally appropriate.
Teenagers (13–17 years)
By the teenage years, the mattress requirements start to resemble adult needs — firmness preferences depend on sleep position and body weight. Taller, heavier teenagers may need a medium-firm option. Firmness preferences also become more personal at this age.
Mattress Sizes for Children in Australia
- Cot: standard Australian cot size is 130 x 69cm
- Single/King Single: single (92 x 188cm) suits most primary school children; king single (107 x 203cm) provides more room for taller or growing children
- Double: 138 x 188cm — some parents choose this for growing teenagers to avoid replacing too soon
Materials to Look For (and Avoid)
For children's mattresses, material safety is particularly important:
- CertiPUR-US certified foam — tested for harmful chemicals including VOCs, formaldehyde, and heavy metals
- OEKO-TEX certified materials — covers and fabrics tested for harmful substances
- Avoid mattresses without certifications if possible, particularly for younger children
Natural latex mattresses are an excellent option for children — durable, naturally resistant to dust mites, and free from the chemical concerns of synthetic foams.
Best Kids Mattresses in Australia
1. Koala Soul Mate — Best for Kids
Koala's Soul Mate mattress is designed specifically for children and uses their Kloudcell foam with CertiPUR-US certification. It's a medium feel suited to most children's sleeping positions. Available in single and king single.
2. Emma Kids Mattress
Emma offers a purpose-designed kids mattress with child-appropriate firmness zones and certified foam materials. The cover is removable and washable — a practical consideration for children's bedrooms.
3. Sleeping Duck Kids
Sleeping Duck's kids range applies their foam expertise to child-appropriate sizing and firmness. Good materials certification and practical washable covers.
Other Considerations
- Waterproof protector: essential for younger children — choose a breathable version that doesn't trap heat
- Trial periods: even children's mattresses benefit from a trial period to ensure your child is sleeping well on it
- Replacement timing: children's mattresses may need replacing more frequently as body size changes rapidly
Our Verdict
Don't compromise on your child's mattress. A quality, well-certified medium-firmness mattress from a reputable brand is worth the investment for the developmental support it provides. The Koala Soul Mate is our top pick for most Australian children, with Emma and Sleeping Duck also strong options. Always add a waterproof, breathable mattress protector.
Expert Tips for Choosing a Kids' Mattress
Beyond the basics, there are several practical considerations that can make the difference between a mattress that works well and one that becomes a source of frustration.
Test before you buy. Most reputable Australian mattress brands offer trial periods — typically 100 nights. Use this time genuinely. Have your child sleep on the mattress for at least two weeks before deciding. Kids often need time to adjust to a new sleep surface, and you'll get better feedback once they've slept on it multiple times.
Consider growth room. Younger children grow quickly. A king single mattress (107 x 203cm) rather than a standard single (92 x 188cm) can add 2–3 years before needing replacement. The extra cost is usually minimal and can save money long-term.
Temperature matters. Children often run warmer than adults and can't regulate their sleep environment as effectively. Look for mattresses with breathable covers and materials that don't retain excessive heat. This is especially important in Australian summers.
Check the cover. A removable, machine-washable cover is practical for children's mattresses. Accidents happen, and a washable cover makes maintenance far easier than spot-cleaning only.
Ask about warranties. Quality kids' mattresses should include at least a 5-year warranty. This gives you peace of mind and reflects the manufacturer's confidence in durability.
Frequently Asked Questions
At what age should my child move from a cot mattress to a bed mattress?
Most children transition around 2–3 years old, though this varies. Signs of readiness include climbing out of the cot, reaching the height limit (usually around 90cm tall), or simply outgrowing the cot. A king single mattress is a practical choice at this point — it's not too large but provides room for growth.
Can I use an adult mattress for my child?
Technically yes, but it's not ideal. Adult mattresses are often too firm for younger children's lighter body weight and may not provide the same developmental support. Purpose-designed kids' mattresses are engineered with appropriate firmness zones and material certifications specifically for growing bodies. They're a better investment.
How often should I replace a child's mattress?
This depends on body growth and mattress condition. Many children need a new mattress every 5–7 years as their body size changes. Check annually for sagging, lumps, or loss of support. If your child is complaining of back pain or sleeping poorly, mattress replacement may be overdue.
What's the difference between CertiPUR-US and OEKO-TEX certification?
CertiPUR-US certifies foam for harmful chemicals like formaldehyde, VOCs, and heavy metals. OEKO-TEX certifies fabrics and covers. A mattress with both certifications offers comprehensive material safety — ideal for children.
Do waterproof mattress protectors affect comfort?
Not if you choose the right one. Breathable, waterproof protectors allow air circulation while preventing liquid damage. Avoid plastic-backed covers — these trap heat and moisture. Quality protectors like those made from polyurethane-coated fabric are effective and comfortable.
Is a natural latex mattress worth the extra cost for kids?
For children with sensitivities or allergies, yes. Natural latex is hypoallergenic, dust-mite resistant, and free from synthetic foam concerns. For children without sensitivities, a certified synthetic foam mattress is also fine — just ensure it has proper certifications.
Kids' Mattress Buying Checklist
- Correct size for age and expected growth
- Medium to medium-firm feel (appropriate for age group)
- CertiPUR-US or equivalent foam certification
- OEKO-TEX certified cover materials
- Removable, machine-washable cover
- Trial period of at least 100 nights
- Minimum 5-year warranty
- Breathable, waterproof mattress protector included or available
- Good reviews from Australian parents
- Reasonable return and exchange policy
Common Mistakes to Avoid
Buying based on price alone. The cheapest mattress often uses uncertified materials and breaks down quickly. You'll end up replacing it sooner and spending more overall. Invest in quality.
Choosing too-firm mattresses. Many parents think firmer is always better. A mattress that's too firm for a child's body weight can actually cause discomfort and poor sleep, not improve it.
Skipping the trial period. Don't assume a mattress is right without actually testing it. Sleep quality takes time to assess.
Ignoring material certifications. If a mattress doesn't list certifications, that's a red flag. Children's developing bodies are more vulnerable to chemical exposure.
Forgetting a protector. A mattress protector isn't optional for children — it's essential. Accidents, spills, and normal wear require protection.
Final Verdict
A good mattress directly supports your child's sleep quality, development, and wellbeing. Investing in a certified, appropriately-firmed mattress from a reputable Australian brand like Koala, Emma, or Sleeping Duck is worth every dollar. Pair it with a breathable protector, use the full trial period, and you'll have made a decision that benefits your child's growth and health for years to come.