There are 3 main different childrens bed sizes:/nCot / Junior - this is 120 cm x 150 cm and cheap kids bedding sets for this size tends to include one duvet cover and one pillowcase./nSingle - this is 135 cm x 200 cm, and bedding sets for this size usually come with one duvet cover and one pillowcase./nDouble - this is 200 cm x 200 cm,and this cheap kids bedding set for older children tends to include one duvet cover and two pillowcases.