My 3 y.old son is in a convertible carseat that I believe goes up to 70 lbs. He is only about half that weight. Should I anticipate him in that for awhile or should I be thinking about next seat. If so, what type of seat(are they called boosters) come next? I have seen the boosters for older kids but sort of confused between convertible and what's next. TIA
Re: what car seat next?