I need some advice. This was my first try at incubating eggs. Yesterday was 21 days and 3 out of 28 eggs hatched - one has about a pea sized bubble of yolk sac sticking out and the other 2 appear normal. One egg pipped yesterday, but died in the shell without going any further. Today, one more egg pipped and this chick finally popped out of the shell and I noticed that it has about a 1/2 inch long piece of hold sack that appears worm like sticking out. Does anyone know whether this is happening due to the conditions within the incubator? I am trying to find out what I may have done wrong so that I can avoid this the next time. I candled my eggs and observed veins in many of the eggs, but am now surprised that so few actually hatched. I also wander i the chicks that have some of the yolk sack sticking out will die soon or if they have some chance to survive and be normal. I don't know if I should wait for nature to take its course or if it would be more humane to put them down???