Shopping for leak protection can be confusing. Do you need a separate mattress protector under a sheet, or a two-in-one waterproof fitted cot sheet?
This guide compares both options so you can choose the setup that fits your baby, mattress and routine.
Quick answer
Choose a waterproof fitted cot sheet if you want a soft, single layer that looks/feels like a normal sheet and is fast to change at 2 a.m.
Choose a traditional mattress protector + sheet if you already own a protector you love and don’t mind changing two layers.
Side-by-side comparison
| Feature | Waterproof Fitted Cot Sheet (2-in-1) | Mattress Protector + Regular Sheet |
|---|---|---|
| Layers on the mattress | 1 layer (sheet with discreet waterproof backing) | 2 layers (protector under a regular sheet) |
| Comfort & feel | Feels like a normal soft sheet on top | Depends on protector; some feel plasticky |
| Noise | Quiet (bonded membrane) | Varies; some crinkle with movement |
| Breathability | Breathable surface; thin waterproof layer underneath | Depends on protector fabric/laminate |
| Change speed at night | Fast—swap one sheet | Slower—may need to change both layers |
| Fit & safety | Snug fitted corners by design | Protector + sheet both must fit firmly |
| Washing routine | Wash one item after accidents | Often wash sheet; sometimes protector too |
| Drying time | Typically quicker (one item) | Longer if protector requires line-dry |
| Cost over time | One purchase replaces two items | Two separate items to buy/replace |
When a waterproof fitted cot sheet is best
- You want a single, quiet layer that feels like a normal sheet.
- You value speed at night—one swap and back to sleep.
- Your nursery aesthetic is minimal and you prefer fewer layers.
When a mattress protector + sheet is fine
- You already own a protector and it fits firmly with no bunching.
- You don’t mind washing/changing two layers after leaks.
- You have a non-standard mattress and a specific protector that fits it perfectly.
Fit first: measure before you choose
A snug fit is essential for safety. Measure length × width × thickness and match to the closest fitted option. See our full sizing here:
Cot & Bassinet Sheet Size Guide (AU)
Care & washing
Protect the waterproof layer by using a gentle cycle, mild detergent and low heat. Full steps here:
How to wash waterproof bamboo cot sheets
Recommended products
Learn more
Waterproof Baby Sheets (Guide)