Children can safely remain in a belt - positioning booster ( no back , base only ) or high back belt - positioning booster until they are eight years old and up to 4 ' 9 " ( 57 " ) tall 身高在4 ’ 9 ’ ’ ’ ’ ’ ” ( 57 ” )以上的8岁儿童可以安全的使用有带子的后推式汽车坐垫,或是后高空的有带子的后推式安全汽车坐垫。
Children can safely remain in a belt - positioning booster ( no back , base only ) or high back belt - positioning booster until they are eight years old and up to 4 ' 9 " ( 57 " ) tall 身高在4 ’ 9 ’ ’ ’ ’ ’ ” ( 57 ” )以上的8岁儿童可以安全的使用有带子的后推式汽车坐垫,或是后高空的有带子的后推式安全汽车坐垫。