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 unique naturally-sloped nipple promotes a healthy wide latch for your baby by providing a proper resting place for their lips helping to decrease mouth fatigue. The effective 1-piece integrated vent helps prevent colic gas and fussiness with no extra parts to clean or lose. 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.