Wondering what size sheets fit on a cot? Most standard Australian cots take a fitted sheet sized around 130 x 70 cm, but mattress thickness matters just as much as length and width. Get that wrong and the sheet pops off at the corners. That is both annoying and a genuine safety concern for sleeping babies.
For the full picture, see our guide to choosing a waterproof cot sheet.
This guide covers how to measure correctly, how to fit a sheet so it stays put, and what to look for before you leave the nursery at night.
Standard Cot Sheet Sizes in Australia
Australian cot mattresses are most commonly 130 x 70 cm or 132 x 68 cm, depending on the brand. Some compact or travel cots run smaller, around 120 x 60 cm. Always check your specific cot brand before buying sheets.
Mattress depth is the measurement most parents overlook. Standard Australian cot mattresses sit between 8 cm and 15 cm thick. A fitted sheet needs a deep enough pocket to wrap fully under the mattress without pulling away at the corners. Look for sheets with at least 15 cm to 20 cm of pocket depth to cover the range comfortably.
- Standard cot: 130 x 70 cm or 132 x 68 cm
- Compact or travel cot: around 120 x 60 cm
- Mattress thickness: typically 8 cm to 15 cm
- Recommended pocket depth: 15 cm to 20 cm minimum
If you are shopping for a New Zealand cot, dimensions are generally similar, though some imported brands vary slightly. Check the mattress tag before ordering online.
How to Measure Your Cot Mattress Correctly
Grab a tape measure before you buy anything. Measure the mattress length, width, and depth while it is sitting in the cot. Write all three numbers down.
Do not rely on the cot box or the brand website alone. Mattress dimensions can differ from the cot frame dimensions, especially with older or secondhand cots. The mattress is what matters here, not the frame.
Once you have your numbers, look for fitted sheets labelled to match your mattress length and width, and confirm the pocket depth in the product description. A sheet listed as 130 x 70 cm with a 20 cm pocket depth will fit the vast majority of standard Australian cots securely.
Why Sheet Fit Matters for Baby Safety
A sheet that lifts off the mattress is not just inconvenient. Loose bedding in a cot is a recognised sleep safety risk for babies under 12 months. Red Nose Australia recommends a safe sleep environment with a firm, flat, well-fitted mattress and tight-fitting sheets, with no loose bedding around the baby.
The Raising Children Network also outlines safe sleeping guidelines that emphasise keeping the cot free from anything that could cover a baby's face. A properly fitted sheet is the foundation of that environment.
Check the sheet every time you make up the cot. Give each corner a firm tug. If any corner lifts away from the mattress, the sheet is either too small or the pocket is too shallow. Replace it.
What to Look for in a Quality Cot Sheet
Fit is the first priority. Fabric is the second. Babies spend a lot of time in contact with their sheets, so the material needs to be gentle on sensitive skin, breathable through all seasons, and easy to wash frequently.
Muslin and bamboo blends are popular choices for Australian nurseries because they are soft, breathable, and moisture-wicking. A fabric that pulls heat and dampness away from your baby helps them stay comfortable through warmer nights, which matters a lot during the Australian summer. If you are preparing for cooler months, it helps to read up on the nursery and sleep essentials worth having through winter so you can layer appropriately without adding loose bedding to the cot.
Look for sheets that hold their shape after repeated washing. A sheet that stretches or shrinks unevenly will not fit as well over time. Check that elastic runs all the way around the sheet, not just at the corners. Full-perimeter elastic keeps the fit more consistent across different mattress shapes.
How Many Cot Sheets Do You Actually Need
More than you think. Nappy blowouts, spit-up, and middle-of-the-night sheet changes happen regularly, especially in the newborn stage. Having at least three to four fitted sheets in rotation means you are not frantically searching for a clean sheet at 2 am while a baby waits.
Washing cot sheets after every use is standard practice. A gentle, fragrance-free detergent is worth using from the start, particularly for babies with sensitive or eczema-prone skin.
If you are still building out your nursery, it is worth having a look at the full Zoe Sage baby and nursery range to see what fits your setup. And if you are tracking your baby's development alongside all the settling and sleep changes, a read through what the Wonder Weeks are and how they affect sleep can help you understand why some nights are harder than others.
