...by day 23 had pipped the aircell but not the egg. I put a TINY hole in the egg in the aircell area and waited another 24 hours. Still nothing. No peeping but I could see it's beak move a bit. Waited another 24 hours and figured something was wrong. I went ahead and hatched the chick and sure enough, the umbilical cord had wrapped around it's leg TWICE. I think it must have had some brain damage due to decreased circulation. I don't normally hatch silkies...these are for my daughter's grandma. This silkie had a HUGE vaulted skull. Could that have been part of the problem too? When I first started hatching it, I thought it had a tumor in place of it's eye!! Sad... But I have some more eggs in the bator on day 15 so we'll have others soon.