Donald Trump is reportedly expected to claim there is a link between the use of paracetamol in pregnancy and the development of autism - but what does the evidence say?Americans consume more than 40% of all the world's paracetamol, spending in excess of $4bn a year on products containing acetaminophen (as it is known in America - or by its leading brand name, Tylenol). Autism rates in the US are also on the rise - going up from about one in 150 children in the year 2000, to around one in 30 today.There have ...