Should be a regular car seat at that age, not a booster. Boosters are at a minimum for 4 year olds that are 40 pounds or more and can sit still. My 5.5 year old is still in a car seat, not a booster quite yet, much safer in a car seat. And yes, you can check the car seat for free with all airlines. Most car seats expire 7 years from the manufacturing date................I know, I have way to much knowledge of car seats.
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