This is my first time hatching chicks at home with a broody hen, and the first chick to hatch is a cute lil' peeping one. Well, after it fluffed up and dried out for about 4-5 hours, I go into the coop to check on the chick and her mother. So, I pick up the chick and it is kinda weak, but is chirping contently. Then I notice a "string" of yolk with some veins in it sticking out of the body cavity. So my question is, is this natural??? Is the body cavity supposed to close before the chick hatches? Any advice as to how to solve the problem? Please answer quickly!