I got my baby chicks on the 21st of February at 1 day old. Today is April 6th, so they're approximately a month old. They are cornish bantams, red laced white. They have all of their feathers and there are five of them, so they are in a coop outside. There are plenty of shady/sunny spots, always lots of food, and always lots of water. I thought all of my chicks were healthy until now. One of them is a bit smaller than the others, and today when I went to check on all of my chickens, I found her in the sun completely lying down and not moving. I thought she was dead. I scooped her up and found that she was not, in fact, dead, but very lethargic and limp. I immediately brought her inside and gave her food and water. She soon perked up and started eating and drinking and pecking and walking. She is walking around me and on my computer as I type this. However, when I checked her, I found her to be thin. I tried to check her crop but I'm not very good at that, since before I had quail and I couldn't catch them to check their crops. I got all the other chickens and checked them and they are good weight and normal crops. I can't tell if her crop is hard or if it's empty. Her poops were runny since it's hot out, but since she's come in, her poops are normal. Her feathers are puffed up and her eyes are closing and her head is jerking up and down, as if she's trying to stay awake. But she's standing and eating and drinking. No cough or sneeze. Sorry for the long post, wanted to give as much information as possible. Thank you for any responses.