My last batch of guinea eggs began hatching several days early. I didn't have the humidity high enough. Most of the keats died in the shell. I have about nine healthy keats, out of 40. There is one that I have left in the incubator. It hatched day night before last and I immediately saw that the yolk sac was not fully absorbed. It seemed strong, but couldn't stand. Today it is starting to stand, but a little of the yolk sac is still on the outside and there is an awful rotten egg smell coming from it. Is there anything that can be done, or should I put it down? Has anyone saved one like this?