Another example is insufficiency of vitamins. So vitamins are very important to that fetus and that fetus has to get enough of these vitamins because these vitamins basically help those enzymes in that developing fetus basically function properly and effectively. And so insufficiency of vitamins can also lead to problems with the central nervous system as well as other problems. Now, just because that fetus needs vitamins that doesn't mean taking excessive vitamins is good for that fetus. In fact, it has been shown that if you take vitamin DA or K excessively that will form different types of problems within that developing fetus. So we see that there are many different types of factors that are found in the outside environment, outside of the body that can cause many different types of damages to that developing fetus.