I am under the impression that BPA is only transferred to formula when heated, so I bought a BPA free bottle and have been using it to heat my baby’s formula up in and then taking his favorite Dr. Brown bottles and putting it in there. We have invested in 16 Dr. Brown bottles and I don’t have the $$$ for a lot of BPA free bottles. Am I safe heating the formula in the BPA free bottle and then transferring to the Dr. Brown ones? Anyone else using this technique?