Eventually your child will not be comfortable or fit well into a 5 - point harness car seat. (childproofingtips.com)
A convertible car seat is a car seat that is rear facing for a young baby but converts to a forward facing five - point - harness car seat for an older baby. (mommystroller.com)
If you're using it as a regular harness car seat, you can fit a child up to 90 pounds! (experiencedmommy.com)