CHICAGO (AP) — Exposure to BPA before birth could affect girls' behavior at age 3, according to the latest study on potential health effects of the widespread chemical.The researchers measured BPA in the urine of 244 Cincinnati-area mothers twice during pregnancy and at childbirth. The women evaluated their children at age 3 using standard behavior questionnaires.Preschool-aged girls whose mothers had relatively high urine levels of BPA during pregnancy scored worse but still within a normal range on behavior measures including anxiety and hyperactivity than other young girls.BPA has many uses, and is found in some plastic bottles and coatings in metal food cans. It was widely used in plastic baby bottles and sippy cups but industry phased out that use.The study was released online today in Pediatrics.