We like Zegerid because you can give the medication, then immediately feed your baby. You do not have to wait the 30 minutes after the medication to feed them. It can be mixed with a little bit of formula which makes it easy to give. There was a post a while back about success stories with Zegerid, you may want to do a search and read them. It also is an immediate release form of omeprazole so it works faster after you give it to your baby. We started to see results within a few days of starting it and Abby has been a happy little baby since. 
Robin