Convertible Bottle: Dr. Brown's Options bottle is the market's first convertible bottle that can be used with or without the vent system. The vent system is designed to grow with your baby, offering flexibility as their feeding needs evolve. Vent System: The patented two-piece internal vent system promotes positive-pressure flow, similar to breastfeeding, by fully venting the bottle for vacuum-free feeding. This helps to reduce feeding problems such as colic, burping, and wind. Preserves Nutrients: The vent system channels air from the teat collar through the vent system, bypassing the breast milk or formula to the back of the bottle. This minimizes oxidation and helps maintain essential nutrients like vitamins C, A, and E. Paced Flow: The nipple venting creates a paced flow, providing a feeding experience similar to most nipple-vented bottles. This allows babies to feed more comfortably without the discomfort of ingesting air bubbles. Compatible with Breast Pumps: Dr. Brown's Options bottles are compatible with most breast pumps, offering convenience for nursing mothers who pump and bottle-feed. BPA-Free: The bottle is made without BPA, ensuring it's safe for your baby's use. University Study: A university study has shown that Dr. Brown's fully vented bottles help maintain levels of important nutrients like vitamins C, A, and E during feeding, highlighting the health benefits of the bottle's design. Overall, Dr. Brown's Options Anti-Colic Feeding Bottle provides parents with a versatile and effective solution to common feeding challenges, offering a comfortable and nutrient-preserving feeding experience for babies.