After she was 2 years old/ 22 pounds/ 2 years old, we moved her to a different carseat.
For the primary car, we now use a Britax Boulevard:
http://http://www.amazon.com/Britax-Boulevard-G4-1-Convertible-Laguna/dp/B00OLRKNIW
For the secondary cars, we use cheap Coscos from Walmart:
http://www.walmart.com/ip/Cosco-Scen...arper/26845779
The Cosco is about $40. The Graco is about $90. The Britax is $200+.
For an infant, I would recommend the Graco or the Britax.
The Britax does not have that flexibility, but both it and the Cosco will work from birth to at least 40 pounds.
The Britax and Cosco are both "convertibles", rear-facing or forward-facing. The Britax is
very user-friendly; the Cosco not so much.
Good luck.