There is also the belt positioning booster. Kids can use a high back booster seat whenever they outgrow their car seat usually when they reach 40 to 65 pounds until they weigh 120 pounds.
Child Safety Seat Wikipedia
Height and weight for high back booster. The american academy of pediatrics aap recommends babies be in rear facing seats until age 2 or until they reach the car seats height or weight limit. These seats have a higher back that will provide head and neck support in case of a crash if the vehicle does not have a high enough seat for the child. There may not be a perfect size to determine booster seat usage but the childs height will ultimately help determine how the lap belt fits. From when kids surpass their car seat limits until they are at least four feet nine inches tall. In fact you can use the frontier sear in harness mode up to 90 lbs 58 inches which is the sort of maximum child weightheight limits that you would find on most high back booster seats. High back booster seat weight requirements.
The diono cambria booster 2 in 1 car seat can be used as either a high back booster or a backless booster seat for older children. High back booster seat height requirements. Children may begin using a booster seat as early as the age of 3 but the car seat lady asserts that as many as 50 percent of 10 year old children still require booster seats for optimum lap belt placement. The seat is designed to be safe for children from 40lbs to 120lbs and can be used with children from 38 inches tall. Thats usually 30 to 60 pounds 136 to. Once your child exceeds those generous limits for harness mode the seat can be used in high back booster mode up to 120 lbs 62 inches.
The combination high back can be used as a car seat with a 5 point harness for children up to a specified weight or as a belt positioning booster.