In-utero development falls into neither nature nor nurture influence

“The old speculation by a few people that postnatal vaccines are somehow related to autism was never based on scientific evidence,” Courchesne said. “In fact, objective scientific evidence has established that autism begins before birth, by the second trimester. The causes of autism must occur by that very early stage of brain development. The MMR vaccine is given to children 1 year of age or older, and cannot be the cause of autism since it begins during pregnancy.”

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