J.J.
Before my 1st child was born, a car safety place told us the safest part will be the middle of the back seat (if you were to be in an accident, the infant will not be directly hit if in the middle) so that's where he was till he was old enough to sit facing fwd. then we put him behind the passenger's seat. so now I am pregnant and I hope to put my 2nd one in the middle while my 4yr old keeps his spot. (I havent tried it but I hope both seats fit ok next to one another). Hope this helps.