One of my two week old chicks is not growing like the rest. A few days ago, I noticed that her crop is not emptying well. I have been giving her olive oil, massaging her crop and adding ACV to their water. Now today she has pasty butt. I cleaned her off, but not sure what is going on with her. She is only 1/2 the size of the rest of the chicks. She was smaller than the rest from the beginning, but it is much more noticeable now. She walks around very slowly and stays under the heat a lot. I have been giving them fermented organic feed, and she eats and drinks well. I just ordered some Kocci-Free to give her, but it won't be here for 2 days. I want to raise them as organically as possible, but I also want to give her a good chance.