Right now my friends almost 7yr old (7 in July) is riding in an Evenflo Big Kid Booster. She is 58inches tall and 62lbs. We have a turbo-booster, so I'm not sure of the weight/height restrictions on using it as a high back booster. I was just thinking maybe she should move her b/c she looks to big to be sitting in it, AND when your driving and you make a turn, the thing leans to the side, like hard core. I thought I'd ask here and see what you guys think. Oh, and being that the law in MO is 8yrs, 80lbs or 4'9", I doubt she'd buy a different booster to make it work, since she's so close to meeting all of the "requirements" to ride in just the seatbelt. (I'm guessing if she knew there was that OR in the "requirements" she'd pull her out of the booster since she's 4'10"... (is my math right there?) For me, its hard to imagine my kid being that big at almost 7. My oldest will be 7 in September, and she's only 48inches tall and 52lbs.