Developed with Pediatric Feeding Specialists . the Evenflo Feeding Balance + Wide Bottle is designed to support healthy bottle feeding without interfering with your breastfeeding journey. The included Slow Flow Nipple has an intentional . slower flow rate and helps prevent chugging . allowing for a calm . gulp-free feeding at baby’s pace. The Balance + Wide Bottle has molded measurement markers in both ounces and milliliters to provide an easy and accurate way to measure the volume of liquid. All Evenflo bottles and nipples are 100% free of BPA . polycarbonates . PVC and phthalates . and are also made of FDA-approved food grade material.