My 3 week old baby suddenly became very gassy and fussy on Friday. He has spit up twice since. He's farting all the time and they stink. He's still pooping and not constipated. It's so weird because he was fine all through the night and then picked up where he left off in the morning. My pediatrician said not to worry at this point. He's formula fed with gerber good start. I'm trying to monitor a little while longer before switching formula. Anybody else out there experiencing some out of character behavior?

I'm afraid he is becoming colicky. He gets rigid and inconsolable.