Please somebody help me I am trying to decide between the Graco Nautilus and the Britax Frontier. My son is 2 1/2 years old - 40lbs and 40 inches. I thought I had it figured out I was going to go with the 3-1 nautilus than I read somewhere that people were having problems with the crouch strap and that it is supposed to be either at or in front of your child. So I took him to toys r us and sat him on it and it is between 1 1/2 to 2 inches UNDER him. So I called Graco and the women said that "they" are "now" saying that it is OK if the strap in under your child. Then I decided to try to find out if there was some kind of guidelines for the placement of the strap maybe in the manual or something, so I downloaded the manual for the nautilus and the frontier and they both say in the manual that the strap should be at or in front of the child. I hope to use the seat with the harness for at least 2 years. So is it really a good idea to start out with it that far under him?