What does vitamin a do to an unborn baby?

Well. It is the lack of vitamin such as Folic Acid which may harm the baby. Other than that, low vitamin d level in the mother has been linked to a higher risk for asthma in the baby. There may be others that I am not aware of.

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What are some things that vitamin a does to unborn baby?

VITAMIN A. Vitamin a is needed for the production of rhodopsin, a photoreceptor pigment in the retina. If the mother takes megadoses of vit.A, it causes birth defects. Deficiency impairs immunity and occular effects. Read more...