Q. Are there any other sources of BPA that could affect my baby?
A. There is some evidence that BPA is found in the lining of metal cans, including ready-to-feed formula. "To lessen the risk, it's best to opt for powdered formula, which is usually not sold in metal cans," says Sonya Lunder, MPH, an analyst at the Environmental Working Group. In a paper separate from the NIEHS study, the Washington, D.C.-based nonprofit found detected some BPA in liquid formula packaged in steel cans from companies including Enfamil and Similac. (Even though powdered formula containers may look like they're metal, most are actually made from a very stiff paperboard material). But if you're not sure whether your container is safe, then hold a magnet up to it, says Lunder. "If it sticks, then the can is metal and you should try to avoid it."