I covered much over here but across the Atlantic it's huge.
Bisphenol A is a chemical used in 9 out of 10 bottles and it's carcinogen. Here the Food Standards Agency say the amounts leached into milk are too small to have any affect but it's being banned in Canada and big companies in America like Walmart are taking bottles containing Bisphenol A or BPA off the shelves.
There are bottles available without this chemical if you feel you want to avoid it.
For more info on this, a bit of a giggle about pregnancy cravings and loads more check out The Girls' Night In on BBC Radio I work for BBC Radio Bristol and recently uncovered a story you might be interested in. It's not been Bristol
www.bbc.co.uk/radio/aod/networks/bristol/aod.shtml?bristol/girls_night