|sunlight is a good source of vitamin D|
In 2008, Dr. John Cannell of the Vitamin D Council published a paper on the link between autism and vitamin D. This was the first published paper suggesting that vitamin D was associated with autism.
A study, which was published in the journal Molecular Psychiatry, discovered that pregnant women who had low vitamin D levels when they were 20 weeks pregnant were more likely to have a child who displayed autistic traits by the age of 6.
The link between vitamin D and autism
Autism Linked to Vitamin D Deficiency During Pregnancy
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Vitamin D supplements may benefit children with autism spectrum disorder