My son is 5 weeks today the efamil gentleease made his belly messed up and he screamed like click work an hour after feeds and every morning at 330am he also pooped once a day on this formula dark green like peanut butter consistency . We started the hypoallergenic formula nutigemin and he's been pooping non stop. He grunts and pushed constantly idk if I should switch formula or not. His poop with this formula is yellow seedy poop multiple times a day what should I do.