Obvious potential causes of autism, or vulnerability to it, are the environment (including increased vaccinations), genetic predisposition, and diet of both the mother (pre-birth and during breastfeeding) and child.
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Although no one knows how autism develops, experts have focused on physical causes such as environmental toxins, the vaccine preservative [[thimerosal]], and the diet of both the mother (pre-birth and during breastfeeding) and child.
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Some experts have speculated about [[genetic predisposition]].