The Playtex ventaire advanced standard gift set has everything you need in baby feeding bottles. The set includes two 6-oz. bottles with stage 1 nipples and three 9-oz. bottles with stage 2 nipples. It also has extra stage 1 and stage 2 nipples as well as 2 extra vent disks and 2 bottle caps. The baby bottles incorporate micro-channel vent technology, which keeps air out of the liquid for bubble-free feeding. It also helps in reducing colic, gas and spit up. These baby feeding bottles have a unique angled design that lets you feed the baby in a semi-upright position. With advanced venting system, these BPA-free baby bottles provide continuous flow of liquid. The bottles open on both ends and are dishwasher safe for easy cleanup. These bottles are leak proof and shatterproof.