A new study suggests that exposure to a common plastic chemical before and shortly after birth may have lasting effects on behavior. Researchers found that male rats exposed early in life to DEHP showed significantly higher anxiety as adults. This plasticizer, DEHP, is used in a wide range of products, from medical devices to toys. The increased anxiety persisted long after the exposure had ended. The rats were more hesitant to explore open spaces. They also spent more time frozen in place. These manifestations are classic signs of anxiety in rodents.