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The Dr Brown Wide Neck Natural Flow patented Natural Flow internal vent system is the only vent that eliminates the vacuum and the air bubbles found in most baby bottles.
It allows air to enter through the nipple collar, without being incorporated into the breast milk or formula. This will helps to reduce colic, spit-up, burping and gas and can help reduce build up of fluid in babies ear.
Patented internal vent system is proven to minimize oxidation of breastmilk and formula, to help maintain essential nutrients.  | 
