There is a concern about plastic baby bottles.
As you may well know is that plastic bottles that contain Bisphenol A are not very healthy for you, but now there is evidence that if you heat your baby bottle it will leak even more Bisphenol A.
Bisphenol A is linked to lots of damage that it could do to your body from reproductive damage to cancer.
Of course there are things you can do about it. One of them is to check if you plastic bottles contain Bisphenol A and that should be easy to find out. Just check under the bottle and look for a small recycle triangle and in that triangle it has a number if that number is 7 then the product contains Bisphenol A.
My advice try to feed you baby with glass as in my view it is the best and safest alternative.
links:
plastic baby bottle concerns article
Some articles about Bisphenol A