Booster seats are for children who have outgrown convertible or toddler seats. Booster seats are for children who are four to eight years old, weigh 40 to 80 pounds, and are less than four feet, nine inches in height. You can use a booster seat until an adult seat belt correctly fits the child without use of the booster seat. Always use both the shoulder and lap belts with a booster seat. Never use only the lap belt with a booster seat.
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