Dr. Brown"s 3 pack feeding bottles have a patented, internal vent system made for your baby"s comfort. This positive-pressure feeding system directs the air to the back of the bottle through the nipple collar to prevent collapse while drinking. These BPA-free feeding bottles come in a set of 3, so you can always have a Dr. Brown"s bottle handy for your baby"s next feeding. Each of these bottles is microwave and dishwasher safe for ease of use. All 3 baby bottles are 8 ounces each and come with 3 level 1 silicone nipples and a cleaning brush. These baby feeding bottles can be used for newborns and babies up to the age of 6 months.