i have a sick 2 1/2 week old columbian wyndotte. she was the runt to start with, but now she is half the size of the others. she has crud growing on one of her toes (couldn't get a good pic). i thought it was poo, but it won't wash off. she is also curling that leg up under her when i pick her up, but she will use it. she also wheezes, actually a little click with each exhale. we have her isolated and have supplied vitamins in the water. she does eat and poop, but not very active. i use puppy wee wee pads on the floor of brooder. all eleven other chicks (ee and wyndotte) are ok knock wood.