How often are you burping him? Try to get a burp out of him every 1/2 oz or so. If he's got a burp trapped in there the formula will come up with the gas.
Make sure he is being winded regularly...my son brought up a lot of milk until someone explained i had to do it (they focused so much on breastfeeding in the classes that they didnt explain how to bottle feed - i simply didnt produce anything so had to).
ok thanks ladies. merry christmas
I sounds like it could be reflux. If you're sure that it's quite a bit coming up I would talk to the pediatrician when you take him in for a checkup. My daughter had really bad reflux, but the meds didn't do anything for her.
As for the bleeding and back pain, I'm not sure what to tell you. i would probably call my OB.
He may need sensitive baby formula, both of my kids did. You might try a can and see if that helps or call his pediatrician my second child had bad reflux and had to have medicine for it.