A new study raises concern about the effects of BPA on thyroid hormone levels in pregnant women and in young boys. BPA is found in plastic bottles, the lining of food and beverage cans, dental sealants and even in sales receipts. Originally BPA was found to cause harmful synthetic estrogen-like effects. Now we are learning that it impacts one of the most critical hormone groupings in pregnant women and children. I teach physicians about testing newly pregnant women at a very specific time, for thyroid hormone levels (including TSH, Free T3, Free T4 and TPO Antibodies) because if left untreated, an imbalance in these hormones will lead to recurrent miscarriage, difficulty producing breast milk, and serious developmental challenges in a newborn.