Part of the Anti-Colic with AirFree vent collection Suitable for ages six to 18 months Includes three 9oz. (260ml) anti-colic bottles with AirFree vents, and two anti-colic nipples flow that help reduce feeding issues like colic, gas, and reflux AirFree vents remove air to keep the nipple full of milk in both horizontal and upright positions for convenient feeding Wide-neck bottles with few parts make cleaning and assembling a breeze Use it with or without the AirFree vent for a flexible feeding experience Spill-proof design ensures a mess-free use Made from polypropylene and silicone for enhanced durability BPA, PVC, and phthalate-free means your baby's food is safe from all harmful chemicals Dishwasher safe for easy cleaning Microwave-safe design allows you to easily warm these bottles