Child's shoulders must reach first height marker to use the seat (approx. 12 months).
To be used with built-in harness from approx. 12 months to approx. 4 years of age or until the child's shoulders reach the middle shoulder height marker.
Child's shoulder must reach middle height marker (approx 4 years of age).
To be used with a lap-sash seat belt from approx. 4 years of age to approx. 8 years of age or until child's shoulder reach the upper shoulder height marker, with head rest in tallest position.