I hadn't considered the differences in car seats from the UK and here in the US, so thanks for bringing that to my attention Erin. I'm going to buy the one here available in the US because if the car seat isn't correct (fitting wise, safety wise and so on), it doesn't bear thinking about does it?
Alexis, good luck for your gender scan. I'm guessing boy, but only because so many boys are due in September that it wouldn't surprize me if another one was on his way!