Reduce air bubbles that cause fluid in Baby's ears with Dr. Brown's 8-oz. bottles. A special patented internal vent reduces air in milk and formula to minimize colic spit-up burping and gas so you'll have a happier more comfortable baby. This handy 3-pk. features three 8-oz. bottles with easy-to-read level gauges. Bottles connect directly to breast pumps. Includes cleaning brush and instructions. Bottles are plastic. Nipples are silicone. Hand wash. Made in USA. Three 8-oz. baby bottles Patented system reduces colic spit-up burping and gas Internal vent prevents air bubbles in milk and formula Easy-to-read formula level gauge Connects directly to breast pumps