Last night while Cora and I were eating dinner she announced that she was the mommy and I was the daughter. This actually happens on a nearly daily basis. But, in a new twist, this time I was told that now that I was five years old, I had to stop sucking my thumb and be a big girl.
Cora herself is four, still a fairly new four, and still quite a devotee of The Thumb. The thumb-sucking as diminished over this year, mostly only popping up when she is tired, sad, scared, or falling asleep. Because it is diminishing, I haven't ever made a fuss about it. In the winter I try to get her to lay off a little due to the chapping (ugh), but that's about it.
Further discussion and role-playing revealed that I could still put my thumb in my mouth if I were really, really scared, if I was falling asleep, and if I was at home.
I should know better, but I am still sometimes amazed at her ability to plan ahead.