Kai loves to suck on his left thumb. He's got a corn on his tiny thumb by now, and some people have been shaking their heads and going "tsk tsk" when they see him do it.
On Friday, MIL cut the fingernail on that particular thumb a little too deeply. He placed it in his mouth, pulled it out immediately and then said, "Painful!"
MIL felt very bad.
The amazing thing is that he stopped sucking his thumb thereafter. It has been two whole days now and he has not been sucking on his thumb. There were times when I caught him fingering his mouth, but that was it. And he seems like a different boy now; more grown up.
Could this be it? The solution to thumb sucking?