When my first chick hatched, he managed to get most of the way out but his leg had something wrapped around it. He kept trying to kick it free. It was connected to the egg at one side, wrapped around his leg and went into his body. I thought it was the umbilical cord and tried to get his leg loose but I couldn't slip his foot through. Thinking it was the umbilical, I snipped it with scissors. I really hope I didn't screw up. Although.....he certainly couldn't have lived like that. Ever see anything like that?