Dr. Brown's Options+ Narrow Baby Bottles are specially designed 2 oz/60 ml bottles with preemie nipples, featuring an innovative anti-colic vent system. This 2-pack offers a comfortable feeding experience with consistent natural flow and helps reduce feeding problems in newborns and premature babies. Key features: • Anti-colic internal vent system • Preemie flow rate nipples included • 2 oz/60 ml capacity ideal for newborns • BPA free materials • Dishwasher safe (top rack) • Compatible with most breast pumps • Removable vent system for feeding flexibility The bottles come with a specialized preemie nipple designed for the smallest feeders. The internal vent system is clinically proven to reduce colic, decrease spit-up and gas, while preserving nutrients in breast milk and formula. The system can be removed as baby's feeding develops, providing flexibility in feeding options. The narrow bottle design makes it compatible with most standard breast pumps for convenient milk collection and storage.