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Car seat safety: Avoid 9 common mistakes

7. Moving to a booster seat too soon

Older children need booster seats to help an adult seat belt fit right. A child can switch from a car seat to a booster seat when the child reaches the highest weight or height allowed by the car seat maker. But it's also important to learn your state's booster seat laws. Different states have different laws about how old a child must be before they can stop using a booster seat. Don't forget: Your child is safest when staying in a car seat with a harness for as long as possible.