My daughter is just about 22 pounds and according to my measurements, 31 inches. She has 1.5 inches above her head in the Cybex Aton infant car seat. I just read that the rule is 30 inches, but wasn't sure if anyone knew if Cybex went by the 1 inch rule as well? I know I need to get a new car seat for her ASAP either way, but wanted to know... TIA