Philips Avent Anti-colic with AirFree vent bottles are designed to reduce feeding issues: such as colic, gas, and reflux. The unique AirFree vent is designed to draw air away from the nipple keeping it full of milk to avoid air ingestion. This vent also keeps the nipple full of milk even when the bottle is held horizontal, allowing for upright feeding. Feeding in an upright position can help to reduce reflux and aid in digestion. The nipple shape is designed for a secure latch for a comfortable feed. The bottle is easy to clean and assemble with few parts. The AirFree vent is only one piece and is easy to clean without any special tools. The Anti-colic bottle features a valve, integrated into the nipple, that reduces vacuum buildup and reducing air into your baby’s tummy. The Anti-colic bottle can be used with or without the AirFree vent, giving you the option based on your baby’s feeding needs. The soft silicone nipple is available in different flow rates for babies of all ages, flows 1-4. We recommend using the Philips Avent Anti-colic baby bottle with Philips Avent Anti-colic bottle nipples. Includes 4 4oz Anti-colic bottles with AirFree vent with Flow 1 nipples. SCY701/04.Bottle Nipple comes in Flows 1. BPA free Bottle can be used with or without the AirFree vent. Easy to clean and assemble wide neck bottle with only a few parts. AirFree vent makes it easy to feed in an upright position by keeping the nipple full of milk. AirFree vent keeps nipple full of milk, not air. Designed to reduce feeding issues: colic, gas, and reflux.Capacity: 4 Ounces. Bottle Nipple Type: Vented - Flow 1. Material Type Free: BPA Free. Color: Clear. Brand: Philips AVENT. Best Sellers Rank: #112 in Baby. Customer Reviews: 4.7 4.7 out of 5 stars 12,042 ratings 4.7 out of 5 stars. : B0961QRR5K. Country/Region of origin: ?Indonesia. Item Weight: ?10.8 ounces. Bottle type: ?Anti-Colic Bottle. Bottle nipple type: ?Vented - Flow 1. Dishwasher safe: ?Yes. Batteries required: ?No. Style: ?4 Pack. Number Of Items: ?4. Material free: ?BPA Free. material_composition: ?80%plastic, 20%silicone. Item model number: ?SCY701/04. Package Dimensions: ?7.59 x 7.25 x 2.5 inches.