These days the baby aisle shelves are lined with products proudly announcing: “BPA-free.” As a mom and a consumer, this is reassuring. BPA (bisphenol A), a chemical used in the production of plastics and many other products, has been linked to a variety of health problems such as reproductive disorders, diabetes and cardiovascular disease. A 2003-2004 national health survey by the Centers for Disease Control and Prevention found BPA in more than 93 percent of 2,517 urine samples from people age 6 and older.