Hi there my DD will climb out of her bigger carseat ( booster with back ) she is nearly 3 and i have had to put her back in the smaller one . She is too big and tall for this one really and i can't risk her getting out of the seat e.g. when putting petrol in , popping shopping into bungalow e.t.c or driving along . She knows how to pull up the lock and open the doors . I did find the Crelling site and the one i think would work is 90 pounds . Any tips anybody please ? x