Even tested: if they only would do it world wide. This is what I believe was the reason my first got problems all from the beginning. Me hypo thyroid when pregnant, or just an Iodine deficiency. http://www.ncbi.nlm.nih.gov/pubmed/24120386
(what the results would be if the group had optimal levels of iodine.. we can only speculate.)
My second pregnancy I had learned. Took some kelp , and a whole lot of other supplements. Also removed some of my 18 Amalgam fillings. He is better off, but one thing any of them have tolerated well: fever.
This is connected to mercury and hypo thyroid. Mercury: an inability to adjust temperature, hypo thyroid an intolerance of both heat and cold.