Most plastics are labeled with recycling codes somewhere on the package. The image looks like a triangular arrow surrounding a number. If your baby's bottle has a "7" inside its recycling symbol, that's a good indicator that it's made from polycarbonate plastic and full of BPA. The BPA backlash has been so great that major manufacturers of baby bottles, like Playtex, and water bottles - Nalgene is one - have bumped the ingredient from their plastics.
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