Hi J.!
When I used cereal in the bottle, I just took a regular steak knife and physically cut a bigger "X" notch in the top of the nipple. Also, I'm not so sure that the cereal itself takes away the spit up. My son, when he was a baby, was a chronic spitter-upper!! :) Basically, my pediatrician at the time, told me to burp him more often throughout the bottle. Try burping them every 2 oz. and if that doesn't work- try after every oz. It didn't stop it completely, but it certainly helped. Before that, I used to have to have a bib on him ALL the time... :) I only used cereal in his bottle when the bottle itself stopped being satisfying on its own. So I'm not sure about that whole cereal thing. I was told the reason why babies spit up like that all the time, is because of the air getting trapped in there. And because they're not developed, like we are, it doesn't stay down when they "burp" and they're not in a good position. It also may be the formula not agreeing with them. I had to switch him from Similac to Carnation Good Start- THAT stuff is great! It's cheaper, and it was so much easier on his tummy. Another thing to think about....
I really hope that it helps- and saves a couple shirts!! LOL
B.