Highback Mode: For children 3-10 years old, from 30-100 lbs and 38"-57" tall
Backless Mode: For children 4-10 years old, from 40-100 lbs and 40"-57" tallTested to meet or exceed U.S. safety standards
As recommended by the American Academy of Pediatrics, children 4 feet 9 inches tall or under should ride in a belt-positioning booster seat.