My 8 weeks old has been passing really foul smelling gas and stools for the last week or so. The stools are also very liquid (like water) instead of curdly. But they're not particularly frequent and they're mustard yellow as usual. Is this normal? Should he see a doctor? The only changes in our lives that I can think of is that he's been taking an antacid for his GER, and I've been eating a lot of whole wheat bread.