I need help choosing a Booster Seat for my 7 YO. She is tall 47". I will have to get back to you on the weight although I know she is around 48 pounds-maybe more. I can't have her in a seat belt because she is thin and I just don't think it is safe for children to ride in a car in an adult size seat belt. I know many who do this though. UGGG! I had her in a Britax Marathon and she is 2 inches shy of having to come out of it. What next? I don't like the ones that are just the base of a seat and you use the seat belt as I don't feel that it will stay under their bottoms in a crash. Any suggestions? I found somewhere on iVillage that talked about recommendations for boosters and I can't find it again. Please help!