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Car seat safety: Avoid 9 common mistakes

8. Moving to a booster seat too soon

Older children need booster seats to help an adult safety belt fit correctly. You can switch from a car seat to a booster seat when your child has topped the highest weight — typically 40 to 80 pounds (18 to 36 kilograms) — or height allowed by the car seat manufacturer. Remember, however, that your child is safest remaining in a car seat with a harness for as long as possible.