My 4yr old is 44" and 51 lbs. Her shoulders are now higher than the straps on the Chicco Nextfit Zip. According to the instructions this indicates she has outgrown her seat, which was confirmed by a call back from Chicco. She is pretty far from the 49" and 65 lbs. at which the seat was supposed to max out. Is this a common issue? Do I have any recourse? It would have been nice if Chicco would have offered a coupon or something. Being that my cars are small and there are four adults, two of whom have to squeeze on either side of the seat, what seat do we get next? I want to keep her in a HBB, as she has low muscle tone and impulsive behavior. I am concerned she would unbuckle herself and she wouldn't be safe in a three point belt. Any advise is greatly appreciated. Thanks!