Earlier investigations suggest that women who take prenatal vitamins around the time of conception have a reduced risk of having a child with autism. The current study showed that obsession of folic acid in those supplements was the source of shielding effect. Women who consume the approved dosage of folic acid (600 micrograms or 0.6 milligrams) which is a synthetic form of the B vitamin called folate, during the first month of pregnancy may have a reduced risk of having a child with autism spectrum disorder, specifically when the mother and/or her child had a specific genetic variant (MTHFR 677 C>T) linked with less efficient folate metabolism.
So the conclusion is folic acid has a potential to prevent up to 70 percent of neural tube defects, or improper formation of the embryonic brain and spinal cord. It proves to be more beneficial before pregnancy as it improve other social, attention and behavioural outcomes in the developing child.

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