I'm confused which stage car seat is correct for my little girl. I have an all stage car seat. My daughter is 4 in October, very tall for her age and weighs well over 2 stone. She currently in stage 1 (5 point harness), but wondered if I can change her to stage 2 where it's just a normal one point seatbelt over the car seat? Ive been on two website I go on and the weight and height for the stages overlap so it's confusing. What stage is your child in?