Convertible car seat

Sarah

My son is close to out grow his infant car seat. What are good convertible car seats? Thanks!

UPDATE: My state law is they have to be rear facing until age 1 and 20 pounds. My son is 3 months now and 17 pounds! I need a car seat that will keep him rear facing until he is a year old. Most I have seen only rear face until 40 pounds. Should I look for one that rear faces longer?