Car seat help moms who have kids

Amanda
How fast did hour Lo grow out of their infant baby seat and need to go into a front facing seat.  We got a front facing seat as a gift for 20lbs and up.  Not sure if I want to store it or return it for now and get the newer on later. Not sure how long car seats last.  Any feed back would be great on this. My infant baby seat says it goes from 4lbs to 35lbs not including length.  Thanks in advanced.