This morning I went out to check on my babies and noticed all the chicks huddled up together in one corner, all except one chick who was too still alone under the heat lamp. I opened the top of the box and no one moved, which is odd, and I touched the lone chick, nothing. I picked her up, nothing, just limp... And she had thrown up, it was thin grainy and slimy. Not sure what caused her to throw up but it appears she either died and threw up or threw up and choked and died because it doesn't look like there is throw up anywhere else, and it doesn't look like she moved after she puked. These are my first chicks and this was my first loss and I am worried now that if she was sick that my other chicks may have caught what she had, they seem fine, but so did she until this morning. I am going to clean the box and waterer and feeder and change out the straw again. They are only two weeks old. Does anyone have any suggestions as to what could have happened, or anything I need to do to protect the rest of the chicks?