I think this is just a transitional period for all of you. He's working on a lot of new things (teeth, walking, new foods, sippy cup, etc.)! It has been our experience that whenever something new pops up (about every two weeks, right?) our son's sleep patterns are most affected. We were having the same kind of bedtime screaming fits. Unfortunately, what worked for us was the most heartbreaking -- we had to just let him cry. The first time, it took about an hour for him to fall asleep (we went in several times to try to soothe him). The next day, it took about a 45 minutes, the next about a 1/2 hour, and so on. Last night, I read him a story, told him it was time to go to bed and put him in the crib. He cried for about five minutes and then was sound asleep. You've got to be willing to let him be by himself and cry for at least 15 minutes. Most of the things I read said that's about all it takes. It took us about a week and a half to get to that point, but, now he's doing well. Just be patient and consistent and you'll get over this hump!