There are some studies that were published in late 2013 that strongly correlate the use of acetaminophen in pregnancy or childhood with autism/ASD.
It appears that the marked increase in the rate of autism, asthma, and attention deficit with hyperactivity throughout much of the world may be largely caused by the marked increase in the use of acetaminophen in genetically and/or metabolically susceptible children, and the use of acetaminophen by pregnant women.
Evidence is presented that Cuba's rate of autism is 298 times lower than that in the US. Cuba has compulsory vaccination of children, but acetaminophen is rarely prescribed and is not available OTC. In contrast,
In the United States, some physicians have started to advise parents to begin to take acetaminophen prophylactically daily 5 days prior to childhood vaccines; some children on such prophylactic treatment had an autistic regression that began prior to vaccination...
The study linked above also notes the following study that was also published in 2013: