I often get asked why my kids normally drink out of glass sippy cups. I, like most parents invested way too much money into "BPA-free" plastic sippy cups. The reason for going BPA-free was because BPA is a hormone disrupting chemical which mimics the female sex hormone, estrogen. Exposure during development of BPA has been linked to wide range of health problems including reproductive harm, altered brain development and even cancer later in life.
A new study shows that a BPA-free label doesn't mean a product is harmless. When scientists conducted lab tests on more than 20 top-brand baby bottles along with more than 450 plastic food and beverage-packages, virtually all leached chemicals that acted like the hormone estrogen, even though many were free of BPA. Heating plastics, even those that are BPA-free, causes the leaching of these hormone-like chemicals even more rapidly.
After further research, we decided to ditch the plastic cups and plates and use glass and ceramic. It's definitely an investment, but completely worth the peace of mind and health benefits!