Philips avent classic plus twin bottle set contains two 4 oz feeding bottles ideal for feeding new borns the set contains two anti colic feeding bottles that comes complete with the teats and venting system built in the anti colic system prevents vacuums forming in the bottle and allows the air to flow into the bottle giving a steady flow and is clinically proven to reduce infant colic the whole bottle is safe for use in sterilisers amp is top rack safe in the dishwasher the stage 1 teats