If I had known about this before E was almost 2yo, I would have kept her rear facing for alot longer. She didn't hit 20# until she was 15mo so she was rear faced a little longer than usual, only because she was a lightweight. The law states that an infant must be rear faced until they are 1yo AND 20#. The is the bare minimum. AAP now recommends rear facing to the limits of your convertible seat or 2yo. Since many convertibles rear face up to 35-40# now, there is no reason we should be doing the bare minimum for our children.