Size:9 Ounce Dr. Brown's Options 3 Piece Wide Neck Glass Bottles, 9 Ounce . The anti-colic vent system is designed to grow with baby, and we recommend using this system to experience all the health benefits of our bottle. It helps reduce feeding problems, helps digestion and helps preserve vitamins. Some moms and dads find removing the vent a convenient option as their baby’s feeding becomes more developed. The nipple venting creates a paced flow, and provides a feeding experience similar to most nipple-vented bottles.

• 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. Bpa free. Dishwasher safe top rack only
• Controlled flow so babies feed at their own pace