Bottle-fed babies absorb the most bisphenol A

Bisphenol A (BPA) is a primary element of polycarbonate synthetic materials that are used to manufacture plastic items for everyday use, such as reusable water bottles, food containers, baby bottles and food packaging. Plastics made with BPA usually have the number 7 on the bottom. Such containers tend to release BPA into the food or fluids within at a small rate. BPA is a hormonally active substance that acts like the natural hormone estrogen and as an anti-androgen (inhibits the biological effects of male sex hormones). Small quantities of BPA can have an affect on sexual development, especially of fetuses and babies. In the recent years there have been several studies looking at health risks associated with BPA. Although no direct evidence of harm to humans yet exists, the US National Toxicology Program (NTP) has indicated some concern about the potential negative health effects of BPA on infants and children. ( Chemical In Plastic Bottles Raises Some Concern )
A new report by ETH Zurich (2010, April 6) summarized in Science Daily indicates that babies fed using PC bottles are the most affected by the exposure to BPA - Endocrine disruptors: Babies absorb the most bisphenol A
With this in mind it can be considered a safe practice to give preference, when possible, to glass, porcelane and stainless steel food and liquids containers, and BPA-free baby bottles.