Happy Feeding Reduces Colic, Spit-Up, Burping & Gas Helps Preserve Vitamins C, A + E Plus Lipids By Handi-Craft BPA Free Vacuum-Free Feeding Helps Digestion Helps Reduce Feeding Problems Proven to Help Preserve Bottle Milk Nutrients* Full-Vented Bottle Design Internal Vent System and Silicone Nipple Work Together Internal Vent System Air enters the bottle collar and routes directly through the internal vent system. The air channels through the vent tube, bypassing the milk, to the end of the bottle. The vent prevents aeration of the milk, vacuum pressure and nipple collapse. Baby feeds comfortably while milk flows freely, like breastfeeding. 0 m+3 m+6 m+9 m+9 m+ Level 1Level 2Level 3Level 4Y-Cut Chose the right nipple. Made of super-soft-high-grade silicone, each nipple level provides a different flow rate. Contents: 1-4 oz /120 ml Wide-Neck baby bottle. 1 - level 1 silicone nipple. 1 - Cleaning brush. Instructions. *Per a recent university study.