These mothers are concerned about environmental toxins. Most of the tens of thousands of chemicals used have not been studied or researched. We have no idea what we are putting in and on our bodies everyday. This onslaught of environmental toxins includes pharmaceuticals as well. Psychopharmaceuticals are all neurotoxic.
There is pressure on doctors to ‘follow the evidence’ even though the evidence may be deeply flawed and biased due to considerable conflicts of interest. Another concern is the fact that doctors are remunerated for doing certain things, which can make it difficult for them to take a truly objective stance of some of what they do. (learning from patients is key)