We got 3 chicks Monday. [6 days ago] The first few days, one was smaller then the other 2, and I thought she wasn't doing well. The last day or 2, I noticed she has grown a lot, caught up to the larger of the 2 healthier ones. While at the same time, one of the previously healthy ones began to lag behind size wise, and now is unable to stand, or even hold her head in a normal position. I'm thinking she only has hours to live at most. I have no experience with chicks, but we have had a lot of pet bunnies, and I've seen a few fade before they went.