There's no hurry to switch your child to the next stage. Bumping up a stage as soon as your child reaches the minimum to do so is not a milestone to be celebrated. For maximum protection, keep your children in each stage for as long as possible.
Here are 8 Rear Facing Myths busted (all the ones you are thinking of right now). This is my favorite snippet "just like you wouldn’t let them run into a busy street because they threw a fit about how fun it is to play in traffic – it doesn’t make sense to compromise their safety in the car just because they throw a fit about being stuck in one place for more than fourteen seconds."
Picture Guide to Car Seat Safety. This is something that is very worthwhile for new parents, but is even a good reminder for long-time parents. Make sure ALL your caregivers who put your kids in your car review it.