emfamil gentlease poop

Desiree
My son is a month and a half and has been on Emfamil Gentlease since he was 2 weeks old. I've noticed his poop is like a dark green/brown and smells bad. Is that normal for this formula? He also spits up now and then. I plan on asking the dr about this at his two month apt. Just wondering others experience with this formula.