Beyond that, there is a suspicion that some mothers of autistic babies have a genetic impairment in their production of vitamin D, even if they do go out in the sun. The study I've signed up for (assuming I get pregnant again in the next 4 years, which is by no means a guarantee) plans to test vitamin D levels bi-weekly during the third trimester in women with at least one diagnosed autistic child, and supplement with direct injections as necessary to keep the numbers in a solidly healthy range.
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