ok, i'm trying one more thread. they say third time is a charm. I assisted a welsh harlequin duck egg that had pipped, but not made progress in at least a day. after starting, i caused some bleeding and stopped. continued a few hours later, and stopped again when i saw more blood. the result is a baby whose face is out and body still in shell. Sheldon has been that way for two days now, in the incubator. I have the humidity at 55-60%. higher than that, it steams up and causes extreme temperature spikes. I didn't want to ever use this incubator again, but had a broody give up right before hatching day, so I candled and transferred eggs that looked viable into the incubator. so here we are now, with a half hatched baby.
You need to use coconut oil or olive oil very sparingly with a qtip on the outside of the membrane as you slowly work the shell back. You should be able to see veins in the membrane and if you do you need to wait until they go away. The baby will be very tired and will make chewing or licking motions like it's eating something while in the egg and this means it's still absorbing the blood vessels and yolk sac from inside the egg. Once it's done that it will start chirping like mad and will act like it's trying to stab at the air where the shell would have been with it's beak. That's when to try slowly taking the egg shell back to see if you can free the baby up completely. If you hit any blood apply pressure for about a count of 10 and then put back in the incubator to rest for an hour or so. Take it very slow and give the baby breaks in between.