With DD, I just kept using the infant seat until she was close to outgrowing it around 9 months old - I had the 22 lb/29 in Graco and she hit the 1 in" mark around 8 1/2-9 months old. I even had a pretty Marathon waiting for her but put off installing it until I had to.
With my DS, I was more aware that people moved to convertibles earlier before the infant seat was outgrown - so I was thinking I might do that with him. However, with carpooling for preschool for DD, it was easier to access the third row with him in the infant seat - so I did push him to the limit which he hit about 9 months old - he was close to the weight limit as well as the 1" mark at that point - and the carpool kids got to have fun climbing through the hatch after that to get to the third row.
We tend to eat out somewhat frequently - so the infant seat was nice for that too until they could sit up. Then I got a fp healthy care booster to use instead.
With my DS, I was more aware that people moved to convertibles earlier before the infant seat was outgrown - so I was thinking I might do that with him. However, with carpooling for preschool for DD, it was easier to access the third row with him in the infant seat - so I did push him to the limit which he hit about 9 months old - he was close to the weight limit as well as the 1" mark at that point - and the carpool kids got to have fun climbing through the hatch after that to get to the third row.
We tend to eat out somewhat frequently - so the infant seat was nice for that too until they could sit up. Then I got a fp healthy care booster to use instead.