Cot Bed Fitted Sheets: Boori, Obaby and Cot Sizes
By For Your Little One | Published: 2026-10-15
Category: Buying Guides
Match sheets to your mattress size before you buy. Learn how Boori 140x70cm and Baby Elegance 120x60cm sheets differ, plus cot bedding care tips.
Quick answer
Measure your mattress before buying any cot fitted sheets. For a Boori cot bed mattress at 140x70cm, choose sheets sized to that footprint, such as the Boori-compatible 140x70cm pack of two. For a Baby Elegance 120x60cm cot mattress, choose the 120x60cm jersey pack of four. If the size label does not match your mattress, the sheet will not stay put.
Measure the mattress, not the cot frame
Cot frames and cot bed frames are sold in several footprints, and the mattress inside is the only measurement that matters for sheets. A cot bed mattress 140x70 is longer and wider than a standard cot mattress, so a 120x60 sheet will not stretch to cover it and a 140x70 sheet will bunch on a smaller cot. Check the mattress label or measure the sleeping surface corner to corner with a tape measure before you order.
Elasticated corners only work when the sheet is cut to the right size. A sheet that is too large creates loose fabric near your baby's face, and a sheet that is too small pulls the corners tight and can ride up overnight. Both problems are avoided by matching the sheet's stated dimensions to the mattress, not to the brand of the cot.
How many sheets do you actually need
Night leaks, spit-up and nappy changes mean most parents change cot bedding at least once a day in the early months. A pack of two gets you through one wash-and-dry cycle; a pack of four lets you keep two clean sheets on the shelf while two are in the wash. If you line-dry rather than tumble-dry, lean toward the larger pack so a rainy week does not leave you short.
Keep one spare sheet folded in the nursery rather than in a laundry basket, so middle-of-the-night changes take seconds. Jersey cotton sheets tend to feel stretchier and softer against the mattress, while plain cotton sheets feel crisper; both are breathable options for a cot.
Fabric, washing and safety checks
Wash new sheets before first use and follow the care label, using a gentle non-biological detergent if your baby has sensitive skin. A fitted sheet should sit smooth with no wrinkles under your baby, and the elastic should grip all four corners without lifting when you tug the middle. Check the corners each time you change the bed, because a corner that has popped off can gather fabric near your baby's head.
Rotate between at least two sheets so each one gets a full wash and dry, and inspect the elastic every few months. Once elastic goes slack, the sheet will not stay flat no matter how carefully you tuck it.
Decision rules for buying cot bed fitted sheets
- If your mattress measures 140x70cm: Buy sheets labelled for a 140x70cm cot bed mattress, such as the Boori-compatible pack of two. Do not size up or down to make a sheet fit; the elastic corners rely on the exact footprint.
- If your mattress measures 120x60cm: Buy sheets labelled for a 120x60cm cot mattress, such as the Baby Elegance-compatible jersey pack of four. A 140x70 sheet will bunch on a 120x60 mattress, so check the label before ordering.
- If you wash more than twice a week: Choose the larger pack so you always have a dry spare sheet on the shelf. Two sheets is the minimum; four removes the pressure to dry overnight.
- If the size label does not match your mattress: Stop and measure again, or look for a sheet made for your exact mattress size. A mismatched sheet is the most common reason corners pop off during the night.
Product facts
- Cot Bed Fitted Sheets Compatible with Boori Mattress 140x70cm - Pack Of 2: Cot Bed Fitted Sheets Compatible with Boori Mattress 140x70cm - Pack Of 2, made from 100% super-soft cotton, in a pack of two. Matches a 140x70cm cot bed mattress, so the corners grip properly and the fabric sits flat, with a second sheet ready while the first is washed.
- Cot Jersey Fitted Sheets Compatible With Baby Elegance Mattress 120x60cm - Pack Of 4: Cot Jersey Fitted Sheets Compatible With Baby Elegance Mattress 120x60cm - Pack Of 4, in jersey cotton. Fits a 120x60cm cot mattress and gives four sheets, which suits daily changes and line-drying households.
Who these sheets suit
Best for
- Parents with a Boori cot bed mattress measuring 140x70cm who want a two-pack of cotton sheets
- Parents with a Baby Elegance cot mattress measuring 120x60cm who want four jersey sheets for frequent changes
- Anyone who wants to match sheets to a measured mattress rather than a cot brand name
Not for
- Cot or cot bed mattresses in sizes other than 140x70cm or 120x60cm
- Parents looking for a waterproof or mattress protector layer rather than a fitted sheet
- Anyone who has not yet measured their mattress and cannot confirm the size
