Congrats on the purchase. I'm sure the Q3 will keep you and the baby safe. Be sure to do good research on child's seats because I listened to a radio program once that questioned a lot of the science behind them. Here I found the TED talk on it.
http://www.ted.com/talks/steven_levitt_on_child_carseats?language=en
http://www.ted.com/talks/steven_levitt_on_child_carseats?language=en