In published research, compelling evidence is shown that acetaminophen (does not cause autism) but increases the incidence of autism, attention deficit with hyperactivity and asthma in genetically and/or metabolically susceptible children.
Tragically, we don’t often know who those susceptible children are until they suffer damage!
Acetaminophen is sold Tylenol or Paracetamol. In other countries you may see Panadol or Calpol.
In the US, acetaminophen is sold over-the-counter, in spite of the fact that it results in death for hundreds of Americans each year.