Cot Bed Sheet Size Guide: 140 x 70, 120 x 60 and Standard Dimensions

A cot mattress measures 60 x 120 cm, a cot bed measures 70 x 140 cm, and a U.S. standard crib mattress runs about 28 x 52 inches.

Buy the sheet that matches your mattress, not the wooden frame around it. Most wrong-size sheet purchases trace back to one assumption: that “cot” and “cot bed” describe the same furniture. Retailers treat them as two mattress sizes, and the gap is roughly 10 cm in width and 20 cm in length — enough slack for a sheet to bunch, ride up a corner, or pull loose the moment a toddler rolls over.

What Size Sheet Fits A Cot Or Cot Bed?

A cot takes a 60 x 120 cm fitted sheet; a cot bed takes 70 x 140 cm. Dreams’ mattress size guide lists both under separate entries, Toddler at 70 x 140 cm and Cot at 60 x 120 cm, confirming they are distinct products.

In inches, that’s roughly 23.5 x 47 inches for a cot and 27.5 x 55 inches for a cot bed. Retail charts sometimes round to 23.6 x 47.2 and 27.5 x 55, so a fractional difference isn’t a mismatch.

Terminology is where buyers get caught. DIY carries fitted sheets in both 120 x 60 cm and 140 x 70 cm, and one listing describes a sheet fitting 140 x 70 cm cot bed mattresses up to 15 cm deep. Note both variables: width and length, plus depth. A sheet can be the right rectangle and still fail if the mattress is thicker than the pocket allows.

Why The “Standard” Label Means Two Different Things

U.S. nursery bedding is organized around the standard crib mattress at about 28 x 52 inches, so a U.S. crib sheet will not fit a 60 x 120 cm cot or a 70 x 140 cm cot bed. The words look interchangeable in a search bar but describe different furniture — which matters most for anyone buying across markets. Hunt for the printed mattress measurement, not the word “standard.”

Another naming trap: retailers rotate between “cot bed,” “adjustable bed,” and “toddler bed” for the 70 x 140 cm size, and some push the 60 x 120 cm size under the cot bed label too. Dreams keeps Toddler and Cot as separate rows, while DIY sells both under cot bed fitted sheet listings. When a listing’s prose and measurements disagree, trust the measurements.

Buying in bulk before the furniture arrives is where this bites hardest. If the nursery plan includes a cot and a larger toddler bed later, sheets bought for one won’t serve the other. A tested roundup of cot bed sheets we’ve compared side by side helps confirm which sizes each set ships in before you commit.

How To Measure Before You Buy

Measure the mattress itself, top surface only, and note depth as well as width and length. Sheets are cut to hug a mattress, so extra foam or a thick protector can push a correctly labeled sheet out of range.

1. Pull the mattress out of the frame and measure width across the top surface, edge to edge.
2. Repeat lengthwise for the full rectangle.
3. Measure side height for depth and compare against any depth limit printed on the listing.

On depth, DIY caps one cot bed sheet at mattresses up to 15 cm deep — a real ceiling. Go thicker and the corners lift under tension; if your mattress exceeds a listed depth limit, that sheet is wrong no matter how well the rectangle matches.

Fit is a safety question, not just tidiness. A fitted sheet that pulls free can gather around a sleeping baby, and the fix is buying to the mattress spec rather than stretching a loose sheet. Dreams publishes a size chart covering cot, toddler, and larger bed sizes; the numbers above match it: Dreams’ mattress size guide. Two sheets per size is the practical minimum, since one will be in the wash while the other is in use.