This is a reply to # 2,011,206

 

If you want a specific reason, here's one for example.  Lets assume that the iodine is knocking free bromide into your bloodstream.  I wouldn't want to have the fetus get too much bromide.

 

As far as lactation is concerned, I'd be concerned in a similar way but to a lesser amount.  Then again, people can panic over even traces of the safest therapeutic agent known to science.  news.discovery.com/human/breastfeeding-marijuana-mom-busted-dnews-nugget-121031.html