So sorry. It might be a good idea to get a kitchen scale and weigh your other chicks. Then write down all their weights and keep a close eye on those that weigh less than they should. When I have a problem like coccidiosis with mine I weigh them dailey. A healthy young chick should make daily gains, so if they don't, it's a sure sign something is wrong.
I will look for a weight table that shows target weights.
Should I be worried about this poop? All babies have clean vents. I watched each of them poop normal poops earlier today when I found the first weird poop. This is the second orange-ish looking poop I have found today. They are 5 days old.
Five days old is a little young for coccidiosis, but I could be wrong. I'm on the iPad now, so can't get a good look at the poop, but will look at it later when I can get on the computer.