A clinical study confirms that babies using new Playtex VentAire Advanced bottles had less gas, spit up, colic and other discomforts vs. Avent, Gerber and Evenflo reusable bottles. With the wider bottle, and a NaturalShape nipple shaped more like the breast, the VentAire Advanced wide bottle is designed for babies switching between breast and bottle OR transitioning from breast to bottle feeding. VentAire Advanced bottles are easy to clean and come with a leak proof, breakproof guarantee. The bottles are compatible with our line of Nursing Necessities breast pumps. BPA Free, made by Playtex A leader in Infant Feeding.