A graph showing a similar rate of increase in electromagnetic radiation exposure and increased rates of autism can be seen around 42 minutes in the following video, Dr. Erica Mallery-Blythe – Electromagnetic Radiation, Health and Children 2014:
This type of radiation can be from wireless cell phones or laptops or from living very close, within a few miles, of high powered electric lines or power stations.
And even wirelessly connected toys might be harmful to children. [1, 2, 3] A computer or telephone that is not wireless, but is on an old-fashioned landline would not have the same level of electromagnetic radiation.
Tinfoil hats would only act as an antennae and possibly increase radiation absorption, however grounded metal foil might absorb the radiation rather than deflecting it and causing it simply to bounce around more. Water also absorbs this type of radiation which may be part of the reason electromagnetic radiation is dangerous to humans and other life forms – we are water based. 
A nonprofit organization of physicians who would like to increase awareness of electromagnetic hypersensitity has more information available on their website and an opportunity to join their group: http://phiremedical.org/tag/pdfs-for-electromagnetic-hypersensitivity/
I’ve filed this under both autism and calcium because EMF radiation can cause an increased flow of calcium into the interior of cells which can lead to overexcitement of the cell and may lead to cell death. People with hypersensitivity to electromagnetic radiation have measurable differences in their skin in response to exposure to EMF radiation compared to non hypersensitive people. An increase in mast cells may be part of the difference between the two groups.
See this video for more information, and/or a research article by the speaker regarding electrohypersensitivity, https://www.ncbi.nlm.nih.gov/pubmed/17178584:
Disclaimer: Opinions are my own and the information is provided for educational purposes within the guidelines of fair use. While I am a Registered Dietitian this information is not intended to provide individual health guidance. Please see a health professional for individual health care purposes.