Prenatal vitamins help ensure that a fetus has everything it needs to develop. Research indicates that too little — or too much — of certain substances during pregnancy can increase the child’s chances of having autism.
But many of these studies are observational in nature and are not set up to prove a cause-and-effect relationship. In some cases, unrelated lifestyle factors — such as frequent hand-washing, eating a generally healthy diet, or other behaviors that are potentially more common among people who are thoughtful about prenatal nutrient intake — may explain an apparent link between prenatal nutrition and autism.
Here we explain what scientists know about the link between vitamin exposure, prenatal nutritional supplements and autism.
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