And if they are to actually ingest those radioactive sources, that can cause a lot of damage to that developing fetus. And an unfortunate example of how radiation can affect the developing fetus are the children who are born to mothers who were exposed to the radiation that occurred at Chernobyl. Now, the final two factors I want to briefly discuss is malnutrition and excessive levels of vitamins. Now, what do we mean by malnutrition? Well, clearly, one important thing that a woman has to do when she's pregnant is she has to have a well balanced diet. And that's because she's not only feeding herself but she's also providing the nutrients the glucose, the fats, the proteins, the vitamins to that developing fetus.