
If you have an infant then you are going to want an infant car seat. This is the type of unit that has a carrier that you strap the child into. Then that carrier attaches securely to a base that remains installed in your vehicle.
A convertible seat is used for slightly older children. It comes with a five-point harness that buckles over the child's chest and around their legs.
Make sure that the seat you choose has high safety ratings. Don't budget more than you have to. This is an important purchase that could save your child's life.