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Help. My just-turned-3 y.o. son is HUGE -- 42" tall and 55 lbs. He's in a Britax Marathon now and very uncomfortable because the seat is not deep enough. When he's harnessed in his crotch area is squeezed too tight. We're wondering if he would be more comfortable in a booster seat but have no idea where to begin. Anyone have recommendations as to what would be a good booster seat for a very large child?