Hi,
I have had trouble like that too, I have come to the conclusion that he is just a sicky baby. My Health visitor said its nothing to worry about and it will pass, it is starting to get better now i must admit, he is almost 6months and since he has been on solids that has definately helped. I have always been told never to put the cereal in with the milk, so I never tried that. Instead of giving him full feeds all the time i would feed him little and often, but now he seems to be getting over it. Have you changed his formula recently? If you have any luck with this, let me know the secret!
Bev x