New Vent System Designed to Grow With Baby! Use With or Without Vent Reduces Colic, Spit-up Burping & Gas BPA Free Internal Vent System Helps Reduce Feeding Problems Proven to Help Preserve Bottle Milk Nutrients* Vacuum-Free Feeding Helps Digestion Fully-Vented Bottle Design Internal Vent System and Silicone Nipple Work Together *Per a recent university study. Nipple Levels 0m+3m+6m+9m+9m+ Level 1Level 2Level 3Level 4Y-cut Contents: 2- 5 oz/150 ml Wide-Neck baby bottles 2- Level 1 silicone nipples 1 - Cleaning brush instructions Internal Vent System 1. Air enters the bottle collar and routes directly through the internal vent system. 2. The air channels through the vent tube, bypassing the milk, to the end of the bottle. 3. The vent prevents aeration of the milk, vacuum pressure and nipple collapse. 4. Baby feeds comfortably while milk flows freely, like breastfeeding. We recommend using the vent system to experience all the health benefits of our bottle Helps reduce feeding problems Helps preserve vitamins Helps digestion Vent and nipple create vacuum-free feeding Some moms and dads find removing the vent is a convenient option as their baby's feeding becomes more developed Provides a feeding experience similar to most nipple-vented bottles Nipple venting creates a paced flow