Dark green poop on Enfamil gentlease?

Hi all, my son is almost 5 weeks and is on enfamil gentlease. We were using the ready to feed and now we’ve switched to powder, he’s been on the powder a little under a week. He goes to the bathroom every day/every other day, and his poop is getting consistently greener. It’s now a dark green army color. Is that normal? I’ve read it can be due to the iron in the formula. The pediatrician said the color doesn’t concern her (she didn’t see it I just told her about it) but I don’t know why it still makes me nervous. FTM and I don’t have anything to compare it to, I took a picture but I’ll spare everyone for now. Anyone else’s LO have dark green poop on formula, particularly enfamil?