Polycarbonate milk bottles

Do not use polycarbonate bottles (the really transparent and slightly brittle bottles) they contain a chemical called Bisphenol A (BPA) which has been observed to be leeching into baby bottles.
Use a glass bottle or regular plastic(slightly translucent and more flexible) bottles. Some companies indicate that their bottles are BPA free on the label. Pay attention.
Sanav uses glass bottles that can be easily sterilized and cleaned(old school)

Here is the link(click) to the National Institute of healths website. Scroll down all the way to the bottom for their recommendations.