We're going to be driving some of my 10 year old's friends to the roller skating rink for her birthday party. Last year, when she turned 9, she was still in a booster, so I just put all 3 girls in a booster. They figured out who would sit in which booster based on their heights. This year, she doesn't need a booster in the vehicle we'll be driving, but she's the tallest of her friends at 4'11". How do you handle deciding who needs to use a booster? I can guarantee all but maybe one girl is booster free in her parents' vehicles and not one parent has asked about boosters. Do you check each child for belt fit? Just put anyone under 4'9" in a booster? I have 6 nbbs and 7 girls including my daughter.