Additional Details ------------------------------ Product description: 0m+. 8 oz (250 ml). Clinically proven to reduce colic. Spit-up, burping, and gas. Use with or without vent. DrBrowns Natural flow by handi-craft. No. 1 pediatrician recommended baby bottle in the U.S. Fits most breast pumps. Narrow. 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. See how it works at drbrownsbaby.com. Our bottle works best with the vent system: Clinically proven to reduce colic. Proven to help preserve vitamins. Aids in digestion for a better night's sleep. Flow rate supports breastfeeding. But it's great to have options when baby's feeding develops: Remove vent no need to introduce a different bottle. Feeding experience similar to most nipple-vented bottles. Designed to grow with baby. Helps reduce feeding problems. Our bottles are known for reducing colic, spit-up, burping and gas. Proven to help preserve bottle milk nutrients (Per a university study. Learn more at drbrownbaby.com/nutrient-study). Vitamins C, A, and E are critical for health in infancy. Vacuum-free feeding helps digestion. Good digestion is essential for babies, particularly newborns. Fully-vented bottle design. Closest to breastfeeding. Internal Vent System and silicone nipple work together. Controlled flow so babies feed at their own pace. 0 m+ - Preemie flow; 0 m+ - level 1; 3 m+ - level 2; 6 m+ - level 3; 9 m+ - level 4; 9 m+ - Y-cut. Choose the right nipple. Made of super-soft, high-grade silicone, each nipple level provides a different flow rate. Complies with EN 14350. www.bebeinnova.com. nutrientstudy.com. Learn more at nutrientstudy.com. BPA Free. This packaging is manufactured with 100% recycled paperboard. Made in China.