We have 8 five day old chicks. Some of them have gotten poop around their butt. I have been able to clean it off and have seen that there is nothing blocking the opening. They eat and drink fine. There are two that I cannot clean the stuff off. Will they be okay like that and will the fur grow out? Such a dumb way to put it but it's an important question. The two with messy butts eat and drink and play fine.