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Title: Beware of Lexan plastic
Review: I bought these bottles because they were compatible with my Medela breast pump and the design got good reviews. We've been using them occasionally for supplementary feedings (formula and expressed milk) for our two-month-old and have no complaints with the performance. However, I recently discovered that studies on mice have shown that polycarbonate plastic (Lexan), like that used in Dr. Brown's bottles, can release a chemical that causes reproductive cancers, low sperm count, birth defects, and other problems. Heating the plastic and long exposure increase the risk. So if you must use these bottles, it seems prudent to add the warm milk/formula just before feeding. I personally am going to pitch mine and switch to polypropylene bottles.
