Not sure what compells a child to do this, but I know my DS4 is the same way and always has been. at 2 during car trips he would count mile markers, sometimes mailboxes. The other day he got in a laundry basket and counted the holes in it. He counted the rungs in my daughters crib, counts steps, etc. It does sound a bit obsessive...it's not like he counts all day long or anything but he is a counter definitely. He too is all about Math. He wakes up thinking about Math and numbers, etc. every single morning. Very interesting.
