Obaby Fitted Sheets: 120x60cm vs 140x70cm Size Guide
By For Your Little One | Published: 2026-10-26
Category: Buying Guides
Choosing between Obaby fitted sheets? This guide compares 120x60cm cot sheets and 140x70cm cot bed sheets, with clear decision rules for the right fit.
Quick answer
Choose the 120x60cm fitted sheet for standard Obaby cot mattresses, and the 140x70cm fitted sheet for larger cot bed or toddler bed mattresses. Measure your mattress first to confirm the size.
Why size matters for a safe fit
A fitted sheet that is too small will stretch and may pop off the mattress corners, creating a loose fabric that is a suffocation hazard. A sheet that is too large will bunch up and wrinkle, which can also reduce sleep safety.
Obaby mattresses come in two common sizes: 120x60cm for standard cots and 140x70cm for larger cot beds or toddler beds. These sizes are not interchangeable, so always measure your mattress before buying a sheet.
The trade-off: cot vs cot bed sheets
120x60cm sheets are designed for standard cots, which are typically used from birth until around 2 years old. 140x70cm sheets fit larger cot beds, which can extend the life of the mattress into the toddler years.
If you have a cot bed, you might be tempted to buy the larger sheet to 'grow' with the bed. But a 140x70cm sheet on a 120x60cm mattress will be too loose and unsafe. Always match the sheet to the mattress you currently have.
Decision rules for choosing your size
- Measure your mattress: Use a tape measure to check the length and width of your mattress. If it measures 120x60cm, choose the 120x60cm fitted sheet. If it measures 140x70cm, choose the 140x70cm fitted sheet. Always measure before buying—never assume the size from the cot model alone.
- Match the sheet to the mattress, not the cot frame: Some cot beds can accommodate both sizes, but the sheet must fit the mattress you actually use. A 140x70cm sheet on a 120x60cm mattress will be loose and unsafe. Check the mattress label or manual if you're unsure which size your Obaby mattress is.
- Consider the stage of use: If your baby is still in a standard cot, stick with 120x60cm sheets. If you've moved to a cot bed or toddler bed with a larger mattress, switch to 140x70cm sheets. Buy the size that fits now, not the size you plan to use later.
Product facts
- Cot Fitted Sheets Compatible with Obaby Mattress 120x60cm - Pack Of 4: This pack includes 4 fitted sheets designed for Obaby mattresses measuring 120x60cm, crafted from 100% premium cotton. The 120x60cm size is the standard for most Obaby cots, and the cotton fabric helps keep your baby comfortable and breathable through the night.
Cot Fitted Sheets Compatible with Obaby Mattress 120x60cm - Pack Of 4 - Cot Bed Fitted Sheets Compatible With Obaby Mattress 140x70cm - Pack Of 4: This pack includes 4 fitted sheets tailored for Obaby mattresses measuring 140x70cm, designed to prevent night-time disruptions. The 140x70cm size suits larger cot beds or toddler beds, and the snug fit helps maintain a safe, secure sleep surface.
Cot Bed Fitted Sheets Compatible With Obaby Mattress 140x70cm - Pack Of 4
Fit guidance
Best for
- Parents with a standard Obaby cot mattress measuring 120x60cm
- Parents with an Obaby cot bed or toddler bed mattress measuring 140x70cm
Not for
- Mismatched combinations—a 120x60cm sheet on a 140x70cm mattress or vice versa
