Preventing Baby Reflux

How do you know when your baby has a normal tendency to spit up or when there's a real problem like reflux? One doctor says Pediatricians are over-diagnosing GERD or gastroesophegeal reflux disease in babies. I have to say, my first son had it (as far as I am concerned) and my pediatrician never even told me there were acid-suppressing drugs for babies. So I feel like aggravated by this story. My other two kids did take acid-suppressing medication and it worked great! It made a huge difference within the first week of treatment. I really wish I would have been able to give it to my first son. I don't know if GERD in infants is over-prescribed, but I know my kids benefited from the medication.
Here's more info on the allegations of over-prescribing from an article in Science Daily.
-NewsAnchorMom Jen