Bisphenol A (BPA) is a chemical building block that is primarily used to make polycarbonate plastics and epoxy resins. BPA has been suspected of being hazardous to humans for many decades. Concerns about BPA in consumer products made headlines in 2008 when several governments issued reports shedding great doubt on its safety. It has been known that scratched and worn polycarbonate feeding bottles will leach this chemical into liquids. Since babies are exceptionally vulnerable to hazardous agents like BPA, be certain to ensure their safety with glass bottles.