My son does. Although for him he doesn't even have to be counting things... he will just start counting. Most of the time if he is not eating he is counting in one way or another... although I am not positive he isn't counting while he eats he just can't write it or say it as his hands and mouth are busy. When ever we do something new I have to think ahead about how and if it can be counted and how much time I am going to have to allow for him to count it. With him they are not sure if it is because of his autism or if he is OCD as well as autistic.