I am new to raising chickens, I have 9 baby chicks that I am guessing were hatched on the 27th or so. received them from McM...all were in pretty good shape, but I lost one this afternoon....she looked good earlier in the day other than she had a little pasty butt....I cleaned her bum off and couple hours later I went out to check on them and she was dead. My question is what happens if the pasty butt is left alone or not caught soon enough, will they die? Also, I noticed a couple others have just a small amount on their bum, should it be cleaned off right away? HELP!!!! I don't want to lose any more chicks.