I have 4 new Ameraucana's that are 5 weeks old and all females. I noticed that one of the chicks had a small fluid filled bump between her neck and breast. I've been watching it and it appears to be getting larger. Today I picked her up and a little liquid came from her mouth and her bump is now the size of a small tennis ball. She's eating and drinking and taking dust bath, but I'm really concerned. This doesn't seem normal. Does anyone have any information or suggestions. Thank you so much!