Here is just a partial list of correlates, risk factors, and possible causes that have been the subject of serious studies:
• Pesticides;Not to mention fever during pregnancy.
• Air pollution and proximity to freeways;
• Maternal thyroid issues;
• Autoimmune disorders;
• Induced labor;
• Preterm birth;
• Birth by cesarean section;
• Maternal and paternal obesity;
• Maternal and paternal age;
• Maternal post-traumatic stress disorder;
• Smoking during pregnancy;
• Antidepressant use during pregnancy;
There is another, though with some pushback. Tom Chivers at Buzzfeed:
The journal Child Development published what was described as a "review article" –an assessment of existing literature – by Cindy Sage and Ernesto Burgio. It was titled "Electromagnetic Fields, Pulsed Radiofrequency Radiation, and Epigenetics: How Wireless Technologies May Affect Childhood Development", and was published in a "special section" of the journal addressing technology risks.
The paper got picked up by the UK national media. An article in the Express, published in May, asked: "Could wireless technology be causing MAJOR health problems in your children?"
It said: "Wireless mobile phones, laptops and tablets could be causing major health problems in children and contributing to autism and hyperactivity, a new study warns," and said that these devices, "which even include baby monitors, emit radiation and electromagnetic fields that pierce thin skulls, harming memory, learning and other mental skills".
However, a new paper published in the journal PeerJ by Dorothy Bishop, a professor of developmental psychology at the University of Oxford who specialises in developmental conditions such as autism, and David Robert Grimes, a medical physicist also at the University of Oxford, has issued severe doubts about the study. They said its claims are "devoid of merit" and "should [not be] given a veneer of legitimacy".