"Chicago on Wednesday became the first U.S. city to adopt a ban on the sale of baby bottles and sippy cups containing the chemical BPA.
The Chicago City Council approved the ban on a 48-0 vote. It is slated to take effect Jan. 31, 2010. ...
BPA is short for bisphenol A. It's used to harden plastics in many consumer products including CDs, sports safety equipment and reusable bottles. It's also present in some food container linings.
Experts disagree on whether it poses health risks to humans, but some manufacturers of baby bottles have voluntarily removed it because of safety questions."