Size: Ages 2-5 (Head measurement: 46 cm~ 54 cm, 18", Size 6-6.3/4). The fit ranges from babies and toddlers to kids and children. Measures approximately 8” x 8” lying flat. Children's Hat size 6 to 6-3/4, ideal for many kids age 2-7. The beanie has plenty of stretch for growing into and getting multiple years use.