I was told that there is no relationship between the too, but others on this board have been told differently. My son's ped said that it is more genetically linked. So, far my son has 8 teeth at 13 months old and his twin brother has 6 teeth - You know, I always said that I would never compare them, but I will admit that sometimes it helps since one has CAH. I have not seen you post in a while, I hope all else is well:)