A research team, led by Drexel University in Philadelphia, used three analytical methods to look at 273,107 mother-child pairs in Stockholm, Sweden The children were age four to 14 and had been born between 1996 and 2007.
Women had reported their use of folic acid, iron and multivitamin supplements at their first antenatal visit and cases of child autism spectrum disorder (ASD) were identified from national registers.
The researchers found multivitamin use was associated with a lower likelihood of child ASD with intellectual disability. No consistent evidence was found for iron or folic acid contributing to reduced risk.
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