Thanks everyone for your response. The only big thing I can think of that happened when I was 4 was moving to a new state, which triggered my parents to viciously fight constantly (even to this day). I never really thought an incident could trigger OCD, but I guess that makes a lot of sense. I'm sorry to hear that your daughter is showing signs of OCD so early as well (Poetrylover). It's good that you caught on to it early enough: maybe there is some way to prevent it from getting out of control before she gets older. Good luck to all of you.