I just wanted to say that I agree with all of the above and relay a little story. In one of my first batches (I think the 3rd) I saw a pip, the very first of a batch of 20 eggs. Then I saw nothing going on with the egg for 12 hours, well 17 chicks were already running around the bator and this the first one to pip showed no signs, so I assumed it had drowned and took it out and started to peel off the shell only to realize the chick was alive, I thought once I cracked the egg open the chick would start kicking the other half of the shell and come out, to my surprise the chick just stayed in the same position as if she was still completely inside the egg. I was baffled so I returned it to the bator feeling horrible I was certain the chick would die. The chick remained curled up there the rest of the afternoon only opening and closing its bill every now and then. The next morning I woke up to him and another of his brothers all dry and walking around inside the bator. He hatched on day 22 (I usually have 1 or 2 out of 50 hatch on the 22nd) because I guess that was HIS time. I learned that day not to mess with chicks hatching. If you are certain your incubation was right then all chicks that are supposed to hatch, will. Good luck.
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