BPA and BPS are used in the manufacturing of PC and PES plastic bottles, respectively.
In the past, baby feeding bottles were made from Polycarbonate (PC) plastic due to its tough and transparent properties. PC plastic contains bisphenol-A (BPA), a compound which some researches claim is detrimental to human health. Concerns were raised over the migration of BPA from PC plastic to the milk in the bottles.
Today, instead of PC plastic, baby feeding bottles are made using Polyethersulfone (PES) plastic, which does not contain BPA. However, another compound, bisphenol-S (BPS), is present in PES plastic and some have concerns over the safety of BPS as well.
