He's missing a tooth!
Guillermo lost his first tooth! He lost it Saturday, after it had been really loose for a few days.
As he was wiggling it earlier in the day, he had started talking about the tooth fairy, or, rather, that he didn't think the tooth fairy existed. Here's his theory:
"Maybe an activation device in your tooth goes off when you lose it, and it triggers a dollar."
Either way, he woke up the next day at 5:30 a.m. to check to see if the activation device had gone off or if the tooth fairy had visited. I'm not sure what he thinks happened, but he was pleased to find money under his pillow.