Recently married to a man with a two year old daughter, I kept noticing tons of things that he hadn't researched and car seats was the main thing that I was concerned about. My step daughter is.31 inches tall, and 34lbs. She was front facing in a cosco high back booster. That was a seat recommended for children 40lbs and higher.
She hated that seat, and whenever she fell asleep in the car her head would flop to the side in incredibly painful ways. Although we haven't had this seat very long, we are both very glad that we purchased it. It fits nicely in the middle back seat of a 2011 Nissan Sentra. Definitely would purchase again!