hi J.,
BPA is a real concern. I have a bunch of Avent bottles I used with my 2 older children, before I became aware of BPA. As an earlier letter mentions, Avent bottles and BPA are FDA approved, but the 2 studies used to approve it were industry studies, meaning that the people who published the studies had a vested interest in the results. In other words, the people who wanted it declared safe stood to make money if it were approved. Now it is hard to reverse the approval process of the FDA. Some say that because only such a small bit leaches into the milk, it is okay. I prefer to err on the side of caution, knowing that may be true for an adult, but my baby is so small! BPA has been shown to cause damage to animals the size of my daughter at the level present in bottles.
There are other good suggestions of bottles. I have heard good things about the BornFree bottles. Because my daughter had trouble with the Avent bottles, I purchased some glass bottles online.
The good news about your bottles is, if they are new, they stand a lesser chance of leaching BPA. Washing them by hand or not drying them in the dishwasher will decrease the risk of leaching the BPA. Older, scratched bottles will leach more.
BPA is also present in many canned fruits and vegetables, infant formula cans, and canned soups. Minneapolis is looking at banning this chemical, as are other cities. I hope they are successful!
Good luck!