Dr. Brown’s 4 oz Glass Bottles 2 pack - Brand New!

Feature a patented internal vent system that conducts the air from the nipple collar to the back of the bottle without mixing with the breast milk or formula. This helps get rid of air bubbles and prevents feeding problems like colic, spit-up, burping and gas. Features: *Unique patented two-piece internal vent system *Vacuum-free feeding *Helps reduce oxidation *Easy flow of formula or breast milk *No nipple collapse