I walked into the room where Callum was playing and there he stood, totally quiet, calm and in no visible pain, but with blood spilling out of his mouth. It was certainly alarming and unexpected.
I cleaned him up and peered into his mouth, and after several attempts (he didn't like me poking around), I finally saw the culprit. A new tiny little tooth poking out on the top left side of his gum! Well I'll be damned!