Cool pics! The more developed the babies are, the less likely they are to have mutations from the x-ray. Probably a one-time minimal dose isn't going to hurt anything, but x-ray dose is cumulative for the entire life and doesn't "wear off," what you get you keep forever. Rapidly dividing cells are the most sensitive to radiation. Speaking in human terms, it takes a cumulative dose of 15 rads to the embryo/fetus to cause a birth defect. That is roughly the dose of 1500 chest x-rays or 42 years of background radiation.
I like the disection pic, too. Weird how far the gall bladder is from the liver, and how the kidneys are so distal.
Nanci