A great product to help with switching between bottles and breast feeding. This set has the essentials to help you. The Playtex VentAire Advanced wide bottles feature the micro channel vent technology that helps prevent mixing air from mixing with milk, and the natural shape wide nipple that is shaped like the breast with a wide raised, textured area that helps baby latch on for easier breast bottle transition. Plus the angled bottle supports the semi upright feeding position that helps prevent ear infections. Includes: 5 VentAire advanced wide bottles like 2 6 ounce and 3 9 ounce. Extra nipples fast flow, extra bottle caps, extra vent disks clinical study confirms that babies using new Playtex VentAire advanced bottles had less gas, spit up, colic and other discomforts than with other leading bottles. BPA free.