Yes pasty butt can kill chicks. Get the paste off with warm water soak and very gentle wiping, don't pick it. A dab of oil will help keep further poop from stickingHello y'all I have a ? I have had a chic and a baby guinea die this week both about 1 week old and I noticed both of them had pastry butt. Could that have been the cause of death cause they were active and seemed fine earlier each day?