Are cot sheets a standard size in Australia? Mostly yes, but with enough variation to catch new parents off guard. Most standard Australian cots take a fitted sheet of around 130 x 70 cm. The catch is mattress depth. Sheet depth varies between brands, and if the pocket is too shallow, the sheet pops off corners overnight. That is frustrating at best and a safety risk at worst.
Part of our complete guide to waterproof cot sheets.
This guide covers how to measure your cot mattress correctly, how to choose the right sheet size, and what to check before you close the nursery door.
Are Cot Sheets a Standard Size in Australia?
There is a general standard, but it is not universal. Here is what you will typically find:
- Standard cot mattress: 130 x 70 cm
- Compact or travel cot mattress: 120 x 60 cm
- Bassinet mattress: varies widely, often 70 x 30 cm or similar
Most fitted sheets are labelled to fit a standard cot mattress, but the depth of the pocket matters just as much as the length and width. Mattresses range from about 8 cm to 15 cm thick. A sheet with a shallow pocket will not stay tucked on a thicker mattress. Always check the pocket depth on the product listing before you buy.
If you have a 120 x 60 cot, look specifically for sheets labelled to that size. Standard 130 x 70 sheets will be loose and can bunch up underneath your baby, which is a sleep safety concern.
How to Measure Your Cot Mattress for Sheets
Take three measurements before you shop.
- Length: measure the full length of the mattress
- Width: measure the full width of the mattress
- Depth: measure from the base of the mattress to the top surface
A well-fitting sheet should cover the top surface plus the full depth on all four sides, with enough fabric to tuck securely under the mattress. If the sheet is labelled for a 130 x 70 cm mattress but your mattress is 14 cm deep, check that the pocket depth allows for that. Many budget sheets assume a depth of around 8 to 10 cm.
For a firm starting point on what constitutes a safe sleep surface for your baby, the Red Nose Australia safe sleeping guidelines recommend a firm, flat, well-fitting mattress with a tight-fitting sheet. Loose bedding is listed as a known risk factor.
How to Fit a Cot Sheet So It Stays Put All Night
Even a correctly sized sheet can come loose if it is not fitted properly. Here is how to get it right.
- Start at one corner and pull the pocket fully over the mattress corner
- Move to the opposite diagonal corner next, stretching the fabric evenly
- Finish with the remaining two corners
- Run your hand across the surface to check for bunching or slack
- Tuck any excess fabric firmly underneath the mattress
If the sheet still lifts at the corners, the pocket depth is likely too shallow for your mattress. Sizing up or switching to a sheet with a deeper pocket is the right fix. Sheet grippers and clips are sold as a workaround, but a properly fitted sheet is the safer and simpler solution.
The Raising Children Network guide to setting up a safe cot also recommends checking that nothing is loose in the sleep space, including bedding.
What Fabric Works Best for Cot Sheets
Cotton and bamboo are the two most common materials for baby cot sheets. Both have merit depending on the season and your baby's needs.
- Cotton jersey: stretchy, forgiving fit, breathable, easy to care for
- Organic cotton: softer weave, gentle on sensitive skin
- Bamboo blend: silky feel, moisture-wicking, good for warmer months
If you are also thinking about layering, it is worth reading up on how to choose the right baby nightwear to pair with your sheet setup. Getting the full sleep environment right makes a real difference.
How Many Cot Sheets Do You Actually Need
More than you think. Nappy leaks, spit-up, and middle-of-the-night changes happen without warning. Having at least three sheets means you always have a clean one ready, even if laundry is behind.
If you are putting together your nursery from scratch, it also helps to think through your full sleep and wrap setup at once. Our guide on choosing between swaddles, nursing covers, and blanket wraps is a good companion read for the newborn stage.
Ready to find fitted sheets that actually fit? Browse our full range of baby nursery and sleep essentials and filter by what suits your cot size.
