Convertible Design: This bottle is the market's first convertible bottle that can be used with or without the vent system, offering flexibility as your baby's feeding needs evolve. Vent System: The patented two-piece internal vent system reduces feeding problems such as colic, burping, and wind by eliminating negative pressure and air bubbles. It provides positive-pressure flow, similar to breastfeeding, and helps preserve essential nutrients like vitamins C, A, and E. Paced Flow: The nipple venting creates a paced flow, offering a feeding experience similar to nipple-vented bottles and allowing babies to feed comfortably without ingesting air bubbles. BPA-Free: The bottle is made from BPA-free materials, ensuring safety for your baby. Compatibility: Dr. Brown's Options bottles fit most breast pumps, offering convenience for expressing milk directly into the bottle. Health Benefits: University studies have shown that the fully vented bottles help maintain levels of important nutrients like vitamins C, A, and E in breast milk and formula during feeding. Package Contents: This pack includes three 250ml narrow-neck feeding bottles with Level 1 teats, providing ample supply for feeding sessions. Overall, the Dr. Brown's Options Anti-Colic Feeding Bottle offers an advanced solution to common feeding issues, promoting comfortable and healthy feeding experiences for babies while offering convenience and flexibility for parents.