I had 18 chicks in a brooder together. I am down to 14 now. Over the last two weeks, I have woken up in the morning to find one flat and stretched out on the floor, dead. Each one seemed perfectly fine the night before. The fourth one was this morning, and she was still alive, but barely. I gave her some water with electrolytes and kept her warm, but she died quickly. The first two, who died about 4 days apart, were the two smallest, but the last two were the same size as all the others. They have enough water and food, and they don't seem too cold or hot. They are a little over two weeks old now, and have about 3 square feet in their brooder. Is it too small and they are getting trampled or smothered? They seem comfortable throughout the day. Is it possible they are sick and just have no symptoms I noticed till they lay down and then get trampled? Should I add antibiotics to their water now or is this just what happens sometimes with baby chicks? Thank you!