Evenflo Advanced Plus Angled Bottles include Evenflo’s Proflow Integrated Vented Nipples. These soft silicone nipples rapidly vent directing air bubbles into the bottle, not baby’s tummy which significantly reduces gas, colic, and fussiness. Expertly designed for easy assembly and leak-free feeding, the simple one-piece nipple and vent means no extra parts to clean or lose. The Evenflo’s Advanced Plus Angled Bottle’s shape promotes semi-upright feeding which can help reduce earaches, reflux, and gas. Each bottle also has soft, comfortable grips which make the bottle easy to hold and also has graduation marks in both ounces and milliliters for easy volume measuring of liquids.