Maternal vitamin D levels and the autism phenotype among offspring.

Whitehouse et al. (2013) looked back at stored blood from pregnant women. They checked vitamin D levels during pregnancy. Years later they gave autism-trait surveys to the grown children.

The team wanted to know if low vitamin D in mom linked to autism traits in adult kids. They focused on attention switching, communication, and imagination scores.

Adults whose moms had very low vitamin D scored a bit higher on attention-switching problems. The rest of the autism traits looked the same as the normal-vitamin group.

The link was small and only showed up in one sub-test, not across the whole autism picture.

Kočovská et al. (2012) warned the year before that proof for this link was thin. O et al. answered by adding new data, but still found only a weak signal.

Green et al. (2020) later tested 2020 moms and babies and saw no overall autism risk, matching the weak trend here. Ali et al. (2019) measured vitamin D in preschoolers and also found nothing, stretching the timeline forward.

Together the story is steady: low vitamin D, whether in pregnancy or early childhood, does not strongly predict later autism.

You can reassure worried parents. Low maternal vitamin D is not a clear autism red flag. Keep screening and teaching typical social skills. Save referral energy for stronger risk markers, not vitamin D levels alone.