I had a baby ameraucana hatch out yesturday with what looked like a yolk sack attached by a thread to a large amount of intestines. Poor baby did not survive but what caused this? Can it be avoided? The hatch was poor with only three out of 9 eggs hatching. Eggs were all different breeds. Come to think of it, last hatch only two out of 6 sultan eggs hatched but both babies were weak and they died. Is it the incubator (forced air Hovabator), the eggs or me?? Thanks.