Fewer air bubbles means a happier tummy!Unlike ordinary bottles, the Ventaire® anti-colic vent keeps air at the back of the bottle as baby drinks, so virtually no air mixes with milk & gets into baby's tummy. Unique anti-colic bottom vent: Helps prevent air ingestion for less gas, colic and spit-up. Mix and Match: All Playtex® nipple rings & caps can be used with Playtex® nurser wide reusable bottles.Angled Bottle Design: Promotes semi-upright feeding which is recommended by pediatricians to help prevent ear infections. Easy to clean and assemble• Removable top and bottom for easy cleaning.• All parts dishwasher safe, top rack only. Most Like Mom BPA Free 3 M+Medium Anti-Colic Vent Helps Prevent:• Gas• Spit-up• Fussiness Raised Texture Helps Baby Latch Naturally—Clinically Proven!Natural Wide ShapeEasy Switching Between Breast and Bottle With Naturalatch® Silicone Nipples Trusted by Moms for Over 50 YearsManufactured to Playtex Quality Specifications