I just finished my first ever batch of incubated eggs. I set 40 eggs, 28 have hatched. But 4 of them had "navels" that didn't close completely, and had bloody loops of intestines hanging out. (I don't know what you call that part that attaches their abdomen to the yolk) A fifth one has just a tiny bit of a loop protruding. The first 3 that had this all died after a few hours, there's still one left that I may have to help Cross the Road. Waiting to see how the 5th one does. What incubator conditions contribute to this problem, how can it be avoided in the future? Thank you for your input.