One of our 3, 1 week old chicks, I am thinking has vent gleet? I am very new to this and I have been doing the research. She looks like the pictures I have found, but those chickens all look a lot older. But she definitely has a "messy butt". She is also smaller than the other 2. But they are mixed breeds, and we don't know which breeds, so maybe she is supposed to be smaller. Is it possible for her to have this so young? Is there something else that could be wrong? And what do I do now? Is this something that the other two could "Catch"? Thank you all for your help.