Hi, I'm new here. We are shopping for a used car and want to make sure we get one that will fit our daughter's car seat. She is 2 months now and currently in a Chicco keyfit 30. We will be trying out different model cars with her infant seat, but my question is once she graduates to a rear-facing convertible, are these seats usually longer/deeper than the infant seats? If we buy a car that fits her infant seat comfortably, will we be ok fitting a rf convertible later, or should we plan for extra room in the backseat so we don't end up with our legs scrunched up later on?