My LO is 5 weeks and recently has started acting frantic while nursing. He'll latch on and eat a bunch for maybe 5 minutes and then all hell breaks loose. He'll start grunting, kicking, latching on and off, and cry. My nipple will be in his mouth and he'll be thrashing his mouth back and forth against it while grunting.

Any idea on what this is? Reflux? Gas? He has really bad gas issues already, so I'm wondering if that is what's behind this or if it's something else. He's gaining weight great - he was up 3 pounds in his first month o.O I plan on setting up an appointment with a LC also.