Neither the painkiller Tylenol nor vaccines have been shown to cause autism, the World Health Organization said on Tuesday, following comments from the US president and his administration to the contrary. President Donald Trump insisted on Monday that pregnant women should "tough it out" and avoid Tylenol due to an unproven link to autism and also urged major changes to the standard vaccines administered to babies. Identifying the root of autism—a complex condition connected to brain development that many experts believe occurs for predominantly genetic reasons—has been a pet cause of Trump's health secretary, Robert F. Kennedy Jr.Kennedy has for decades spread claims that vaccines cause autism. 'Vaccine schedules evolve with science'Asked about the fears raised by the US president and his administration over childhood vaccines, Jasaravic said, "Vaccines do not cause autism." But science had "proven" there was no link to vaccines, he said, adding: "These things should not really be questioned."