One of the baby newsletter-type emails that I get had an article about the biting thing and suggested to tell him "No biting!" and put him down immediately as punishment. I tried that this afternoon, but when I put him down I either put him down in the wrong position or he leaned back to see me or out of anger, because he immediately fell backwards to hit his head on a vacuum cleaner. So, of course, I had to pick him back up right away. So much for that "lesson".