Dr. Brown's Options Wide Neck Glass Bottle in Silicone Sleeve, 9 Ounce, 3 Count, Pink/Purple. The market's first convertible bottle that can be used with or without the vent system. Helps reduce feeding problems - Our bottles are known for reducing colic, spit-up, burping and gas. Helps preserve bottle milk nutrients - Vitamins C, A, and E are critical for health in infancy. Vacuum-free feeding helps digestion. Controlled flow so babies feed at their own pace.