That looks like the yolk sac. Derek (Dr. Del) pointed out that it looks like the the snake might have the umbilicus wrapped around it. Is that hatchling moving around okay and does it look smaller than the others? You may need to untangle it if it is.THIS GUY HAS SOME KIND OF MASS IN HIS EGG IS THIS NORMAL? THE WHITE THING PICTURED THERE IS WHAT I AM REFERRING TO.