Moving your child from a cot to a "big kid" bed is a milestone, but it comes with practical questions. What size is a single bed in Australia? Is a king single worth the extra cost? Will the sheets you already own still fit? Sorting these out early saves money and avoids the awkward midnight discovery that the fitted sheet won't stay on the mattress. If you're also comparing kids bedding Australia options, knowing your sizes first makes shopping much easier. This guide covers the sizes, the timing, and the buying tips.
Understanding Australian Bed and Mattress Sizes
Cot mattresses
A standard Australian cot mattress is roughly 132 cm long and 70 cm wide, though exact measurements vary slightly between brands. Many toddler beds use the same mattress size, so a toddler bed can be a gentle halfway step. If you go this route, your existing cot sheets will usually still fit.
Single beds
The standard single is about 92 cm wide and 188 cm long. It suits most children from the toddler years through to the early teens, and it fits comfortably in small bedrooms or shared spaces. There is also a long single, which is the same width but around 203 cm long. It gives taller kids extra legroom.
Some children are particular about how their bed feels at night. If yours is one of them, a sensory weighted blanket is one option families explore as part of a calming routine. Weighted blankets are not suitable for babies and toddlers, and a child must always be able to remove one independently, so check with a paediatrician or occupational therapist first.
King single beds
A king single measures about 107 cm wide and 203 cm long. It is noticeably wider than a standard single, which gives restless sleepers more room to roll around, and the extra length suits growing children. It is a popular choice if you want a bed that lasts into the teenage years. The trade-off is floor space, so measure the bedroom before you buy.
Double beds and beyond
A double is around 138 cm wide and 188 cm long. Most families skip it for children, since a single king usually does the job. Queen and larger sizes are generally better left for older teens.
Note: Dimensions vary slightly between manufacturers, so always check the exact measurements on the product page before ordering.
When to Move from a Cot to a Bed
Signs your child may be ready
There is no perfect age, but many Australian children make the switch somewhere between two and three and a half years old. Common signs include:
- Climbing or attempting to climb out of the cot
- Outgrowing the cot in height, with feet or head touching the ends
- Showing interest in a "big bed" or toilet training at night
- Seeming uncomfortable or cramped
If your child is climbing out, don't wait. A fall from a cot is a bigger safety risk than an early move to a low bed. For current safe sleep and cot guidance, check advice from your child's health nurse or a trusted organization such as Red Nose.
Making the transition smoother
Involve your child in choosing the bedding, keep the bedtime routine the same, and bring familiar items like a favorite soft toy into the new bed. Use bed rails if your child is likely to roll out, and keep the bed low to the ground. Some children adapt in a night, while others take a few weeks, and both are normal.
How to Buy Bedding That Fits Now and Later
Measure the mattress depth.
Mattress thickness varies a lot. A thin foam mattress and a thick innerspring can require very different fitted sheets. Check the depth and choose sheets with deep pockets or stretchy elastic if you're unsure.
Think in seasons.
Australia's climate ranges from hot and humid in the north to cool in the south. Layered bedding works best: breathable cotton sheets, a light quilt or blanket, and an extra layer for winter. Natural fibres like cotton and bamboo blends tend to be more breathable than heavier synthetics.
Buy for growth, within reason.
If you choose a king single now, you can use it for years, but a small child in a large bed can feel lost. A common compromise is starting with a single and upgrading to a king single or long single later. Buying quality sheets in neutral colors, with fun accessories like pillowcases or throws, lets you refresh the look as tastes change.
Choose easy-care fabrics.
Kids' beds get spills, sweat, and the occasional accident. Look for machine-washable sheets and quilts and buy at least two sets so there's always a clean one ready.
Quick Size Reference
- Cot mattress: about 132 x 70 cm
- Single: about 92 x 188 cm
- Long single: about 92 x 203 cm
- King single: about 107 x 203 cm
- Double: about 138 x 188 cm
Final Thoughts
Choosing the right bed size comes down to your child's age, height and your available space. Watch for the signs that they're ready to leave the cot, measure carefully, and buy versatile, washable bedding that works across seasons. A little planning makes the move easier for your child and for you.
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