Could it be that I am diaper free?

After 4 years of changing diapers, with 18 months of those 4 years changing 2 kids diapers, I have not changed a diaper in a week! Little man has decided he is not going to wear diapers anymore at all, only Thomas underwear. And to think, I was going to wait about 3 more months to even try! I do have to sneak in when he is asleep, though, and put on a diaper. He hasn't had an accident napping, yet, but at night he definitely needs a diaper.