The Joovy Boob Baby Bottle offers state of the art features that make feeding easier and more convenient. The unique one-piece CleanFlow vent provides consistent venting regardless of how the bottle is held and the vent's tabs fit perfectly into the bottle's neck, ensuring a proper fit and eliminating leaks or inconsistent liquid flow. The bottle does not require assembly and there is no need to touch any part that comes in contact with the milk or formula. Included Bottle Insulator allows keeping liquids near their desired temperatures longer and works with installed nipple/collar. Durable polypropylene 270ml bottle includes a Stage 2 nipple (medium; 3+ Months). Silicone nipples are moulded (not cut) with the appropriate size hole and tested for consistency. Bottle is for ages birth and up. Ninety-day manufacturer's warranty. Imported. Additional nipples and accessories are sold separately.