I had an order of 12 day old chicks come today. 1 was DOA in the box. Another was nearly and I had been trying to nurse her back to health but she passed. I tried to clear the goo but there was just too much too fast and she suffocated. The others all looked good. I just went back to the brooder and found one of my spitshaubens fresh dead from the same goo! He was fine an hour ago! Now I have 2 more birds exhibiting the same symptoms of full but squishy crop, not eating or drinking any more and sleepy. I'm not sure if its building up in the crop and coming out or what. But the chicks begin to vomit and aspirate the goo. I fed yogurt and save a chick water to them and no luck. They are hardly 24 hours old and are on medicated feed. I noticed that the one pooped a clear yellow with white in it. The rest seam to have green poop from in the shipping box?!? Shipping was less than 12 hours from hatch so it should not be shipping stress as I had my last order take 3 days and everyone was perfect and survived to this day. These chicks were vaccinated. Could the vaccinate have punctured something on these chicks that would cause this? Could it have made them sick? This can't be sour crop at such a young age could it? Even for the 2 who did not eat? The vomit/goo is clear or slightly milky and the consistency of snot. Has any one experienced this before? Can anything be done about it? What the heck is this? If I don't do something fast I'm going to lose half or more of my order before the night is over! Eeeek!