Key facts
- A firm, supportive mattress is recommended for toddlers, not a soft or deeply contouring one
- Foam and innerspring are the two most common toddler mattress types sold in Australia
- The mattress must fit the bed frame snugly, with no gaps at the sides or ends
A firm foam or innerspring mattress, sized correctly for the bed frame, suits most toddlers moving out of a cot. Firmness supports a growing spine and keeps the sleep surface safe. Breathability matters just as much, because toddlers sleep hot and move constantly. Browse kids mattresses by size before you shop by brand.
What type of mattress is best for a toddler?
For most Australian families, a high-density foam mattress is the best all-round choice for a toddler. It is firm, light enough to turn and air out, and priced sensibly for a bed your child will outgrow.
Innerspring is the strongest alternative. It breathes well, holds its shape over years of jumping, and suits children who sleep warm.
The type matters less than three things: firmness, fit, and airflow. Get those right and either construction will serve a toddler well.
What firmness should a toddler mattress be?
Firm. A toddler mattress should feel noticeably firmer than an adult one.
Young children have developing spines and limited strength to reposition themselves if they roll into a dip. A surface that conforms closely around the body also traps heat and restricts airflow near the face.
A simple check at home:
- Press your palm firmly into the centre of the mattress
- Lift your hand away and watch the surface
- It should spring back quickly and leave no lasting impression
- If your hand sinks in or the dent lingers, it is too soft
There is a fuller explanation in how firm should kids mattresses be. Teddybed publishes a junior comfort level page for each mattress so you can check firmness before buying. In Australia, sleep surface firmness for infant products is assessed under AS/NZS 8811.1. Ask any retailer whether their mattress has been tested to it.
Which mattress types suit toddlers, and which do not?
Here is how the common constructions compare for a toddler bed.
| Mattress type | How it feels | Suits a toddler? | What to watch |
|---|---|---|---|
| High-density foam | Firm and even, with very little sink | Yes, the most common choice | Low-density budget foam softens early |
| Innerspring | Firm with a slight bounce | Yes, strong on airflow and durability | Heavier to lift and turn |
| Latex | Firm and responsive | Yes, if the budget allows | Highest price for a bed they outgrow |
| Memory foam | Soft, slow, moulds around the body | Generally not recommended | Traps heat and conforms too closely |
| Dual-sided | Firmer infant side, softer older-child side | Yes, keep the firm side up | Easy to flip to the wrong side by mistake |
Pillow-tops, plush toppers and thick quilted comfort layers all work against what a toddler mattress needs to do. Skip them at this age. The case against memory foam specifically is set out in are memory foam mattresses good for kids.
What size mattress does a toddler need in Australia?
Most toddlers move straight from a cot into a single or king single bed. Buying the bigger size early saves replacing the whole setup at seven or eight.
| Size | Dimensions | Typically suits |
|---|---|---|
| Single | 92 x 188 cm | First bed after the cot, smaller rooms |
| King single | 107 x 203 cm | Buying once and growing into it |
| Double | 138 x 188 cm | Larger rooms, co-sleeping at settling time |
Check the size guide and measure the internal frame before you order, not the outside of the bed. Frames vary, and a mattress that is even a few centimetres out will leave a gap. The teddyDEN kids bed and teddyMONTI kids bed both list internal dimensions on the product page.
How thick should a toddler mattress be?
Around 14 to 20 cm suits most toddler beds. Thickness is less about comfort and more about how the mattress sits inside the frame.
If the bed has guard rails or is a bunk or loft, depth becomes a safety limit. Australian bunk bed standards require the rail to stand well clear of the sleeping surface, so a mattress that is too thick reduces that margin. Check the maximum mattress depth stated by the bed manufacturer and stay under it. There is more detail in guardrails for kids beds.
When should a toddler move from a cot to a bed?
There is no fixed age. Most children make the move somewhere between two and three and a half.
The usual triggers:
- Your child is climbing, or trying to climb, out of the cot
- They have reached the height limit set by the cot manufacturer
- They are toilet training and need to get out at night
- A new baby needs the cot
Teddybed groups its range by age, so beds for 2 to 5 year olds is the shortlist most families need at this stage.
Our cot to bed transition guide covers the move itself, including how to handle the first few nights.
Climbing is the one that overrides the rest. A fall from the top of a cot rail is worse than a fall from a low bed.
How do you know a toddler mattress fits safely?
Fit is the part most parents overlook, and it is the easiest to check.
- Push the mattress hard against one end of the frame
- Measure the gap left at the opposite end
- Repeat side to side
- For a cot, the gap should be no more than 20 mm
- For a bed with rails, aim for as snug a fit as the frame allows
Gaps are where small arms, legs and heads get caught. If a mattress slides around inside the frame, it is the wrong size, not a fixable problem.
What else should you look for in a toddler mattress?
- A removable, machine-washable cover, because toilet training happens on the mattress. Teddybed sells a spare cover so one can be in the wash while the other is on the bed
- A breathable waterproof protector fitted from day one, if the mattress cover is not already water resistant
- Low-emission certification such as OEKO-TEX Standard 100 or CertiPUR on the foam
- Firmness tested to AS/NZS 8811.1 where the product is sold for young children
- A warranty that covers sagging and structural failure, not just manufacturing faults
- A cover you can unzip and inspect, rather than a sealed unit
Once the mattress is sorted, the rest of the bed matters less than parents expect. A low-loft kids pillow and breathable kids bed linen will do more for sleep quality than any premium upgrade.
How long does a toddler mattress last?
Five to eight years is realistic for a good foam or innerspring mattress in a child's bed, though most families replace earlier when they change bed size.
Signs it is time to replace a mattress goes through this in more depth. Replace it sooner if you see any of these:
- A visible dip or body impression that stays after the bed is stripped
- Edges that have collapsed or lost their shape
- Persistent odour or staining that has soaked through the cover
- Springs you can feel or hear through the surface
- Any exposed foam, tears or split seams
Why Teddybed is trusted. Made for kids. Built to last the growing years
Teddybed specialises in children's beds and bedding, so every product in the range is chosen for a child's room rather than adapted from an adult one.
- Kids-only range, sized to Australian single, king single and double beds
- Free shipping to main metros across Australia, delivered to your door as a bed in a box
- 120 night sleep trial, so you can test it through a full season of sleep rather than one night
- Not happy? The bed goes to charity and you get your money back
- Dream now, pay later with ZIP or Afterpay
- Each bed removes up to 50 plastic bottles from our oceans and plants a native tree, explained on the sustainability page
The trial matters more with a toddler than it does with an adult bed. You will not know how a mattress is really working until you have had a growth spurt, a heatwave and a few night-time accidents on it.
Every mattress is listed alongside the bed bases it fits, so you are not left measuring after the box arrives.
How Teddybed compares to other places you can buy. Clear differences. No noise
Buyer decision snapshot
- Buy the mattress and frame together so the fit is confirmed before delivery
- Check firmness ratings, not comfort language like plush, luxury or cloud
- Confirm the cover is removable and washable before you order
- Compare warranty terms on sagging, which is what actually fails in kids beds
- Look for a home trial, because a showroom test tells you nothing about a toddler
| Criteria | Teddybed | Large general retailer | Baby specialty store |
|---|---|---|---|
| Range focus | Children's beds and bedding only | Broad homewares, kids a small subset | Nursery-led, tapers off after the cot |
| Firmness suited to toddlers | Firm as standard across the kids range | Varies by supplier and season | Firm for cots, less guidance beyond |
| Frame and mattress matching | Sold together with fit confirmed | Sold separately, fit left to the buyer | Cot sets, fewer big-kid bed options |
| Advice for the age group | Guidance written for cot-to-bed buyers | General product descriptions | Strong on newborns, thinner on toddlers |
| Best suited to | Parents setting up a first big-kid bed | One-off budget purchases | Setting up a nursery from scratch |
Frequently asked questions
Is memory foam safe for a toddler?
Memory foam is generally not recommended for toddlers. It softens with body heat and moulds closely around the sleeper, which reduces airflow at the surface and makes it harder for a small child to reposition. It also runs warm, and toddlers already sleep hot. A firm foam or innerspring mattress is the safer choice at this age.
Can a toddler use a normal adult mattress?
Yes, provided it is firm and fits the frame properly. The issue is that most adult mattresses are built for pressure relief rather than firmness, so plush, pillow-top and medium-feel models are unsuitable. If you are using an adult single, check the firmness rating rather than the marketing description.
How firm is too firm for a toddler?
It is very difficult to buy a mattress that is too firm for a toddler. Children weigh far less than adults, so they sit on top of a surface rather than sinking into it, and what feels hard to you will feel supportive to them. Firmness only becomes a comfort issue as a child moves into the teenage years.
Do toddlers need a mattress protector?
Yes. Toilet training, night-time accidents and illness all end up on the mattress, and a soaked core cannot be properly cleaned or dried. Choose a breathable waterproof protector rather than a plastic-backed sheet, which traps heat. A mattress with a removable, machine-washable cover handles the rest, and keeping a spare washable cover on hand means the bed is usable again the same night. There is a fuller breakdown in do kids need a mattress protector.
What size mattress should I buy for a toddler in Australia?
A single at 92 x 188 cm or a king single at 107 x 203 cm covers most toddlers. A single fits smaller rooms and is easier to make. A king single costs more up front but usually lasts through primary school and beyond, which makes it the better value option if the room allows it.
Should I buy a dual-sided mattress?
Dual-sided mattresses give you a firmer infant side and a slightly softer side for an older child, which extends the useful life of the product. They work well as long as the firm side stays facing up for the toddler years. Mark the correct side so it does not get flipped during a bedding change.
How much should a toddler mattress cost?
Prices vary widely by construction and size. Rather than shopping on price alone, use the compare our kids mattresses page and weigh up foam density, cover washability and warranty terms on sagging, because those three factors determine whether the mattress survives the years it needs to. The cheapest foam mattresses typically soften within a year or two.
Where can I get advice on safe sleep for toddlers?
Red Nose Australia is the recognised authority on safe sleep guidance for infants and young children, and its recommendations are updated as new evidence emerges. For anything relating to your own child's health, breathing or sleep concerns, speak to your GP or child health nurse. This article is general information about mattress selection, not medical advice.