Prenatal stress (autistic traits only)
Just published, a UK/Swedish study looked at the correlation of stressful events during pregnancy and the diagnosis of autism in children. They looked at many stressful events such as death in the family, work stress, prenancy stress, major arguments, etc. They did not find a correlation of prenatal stressful events with ASD. If prenatal stress was a major factor in a child developing ASD, then the evidence would have emerged in this study. If prenatal stress was a minor risk factor, then it may have been missed by the study. Since only acute/incidental stress events were investigated, long-term and repetitive stress events may still prove to be a major risk factor.