Thanks for the comments ladies. jakobsmom, I agree with you, my DS can self settle most times....so I also think if he is crying something is wrong. He does have reflux and he is on famotadine twice a day but I have a hard time keeping his 2nd dose down him, it always seems to come right back up.

I do use Dr. Browns bottles for the most part but do have some others that I use as well.
He's not really getting worse with the introduction of more formula though, so I am not convinced its an intolerance. I really cannot find a common denominator with his bad nights though, they are kinda out of the blue. But lately he has been waking up about 2-2.5 hours after I initally put him to bed. He starts by just being restless and moving around then he ends up waking himself up. Last night I was able to put him off by about 20 minutes with a binky and pat but then he started getting upset and I had to pick him up. I went ahead and gave him a bottle b/c the last time he had one was 5 hours ago. He drank most of it very fast but when we got down to the last 2 oz, he kept wimpering and letting out little cries.....then I tried to get him burp and couldnt (of course, b/c he was passed out) I held him upright for about 20 minutes and put him in bed and immmediately he started moving about. Looked like he was uncomfortable and making grunting noises. But after 5 or so minutes he fell asleep. And slept really well until 3:55am when he wokeup and just started talking and playing. 30 mins later he was back asleep until 7am this morning. So, for the most part, last night was pretty good. But I still feel like there is an underlying cause for his restlessness and wakeups but like I said, the sleep specialist doesnt believe so.....
Also, last night I thought maybe I would try motrin and teething tablets in case of teeth at BT and same wakeups occurred.....