Ever since I started her on whole milk she has had greenish/yellowish poop. It smells so weird. Kinda like throw up.. doesn’t smell like poop at all. Every time I change her poop diaper she has a terrible rash. Well yesterday she barley drank any milk (because I’m trying to get her on a sippy) and her poop this morning is brown and smells somewhat normal. Could she have an allergy to the milk?