My DS who is nearly 3 is in a rear facing Maxi Cosi pearl on the Isofix base. Checking the limits on his seat though it says 18 kg or 105 cm. I need to measure his height but I know he was 95 cm last time I measured (a while back)! He weighed 17.2 kilos when I weighed him last week. So we need to move on quite soon probably, but all the rear facing Maxi Cosi seats only seem to go up to 18 kg? What do other people use when they have toddlers that are big?!