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Because anencephaly is caused by abnormalities of the neural tube, it is classified as a neural tube defect. Because the neural tube fails to close properly, the developing brain and spinal cord are exposed to the amniotic fluid that surrounds the fetus in the womb.
A deficiency of vitamin K can affect a new-born baby or fetus as well. Vitamin K deficiency may result in internal bleeding (in the skull), malformed fingers, and under-developed facial features like ears, nose, and chin. Vitamin K helps in the overall development of the fetus.