Dr. Brown"s natural flow feeding bottle has a 2-piece internal vent that helps to keep air out of the milk, which helps a colicky baby. It offers vacuum-free feeding for your little one. This baby feeding bottle has a wide neck that allows quick filling and provides a better grip. Each bottle has a capacity of 8 ounces. It uses a level 1 silicone nipple for slower flow. You can replace the nipple over time. This Dr Brown wide-neck bottle is free of BPA and phthalates. It"s made of glass and silicone. It"s dishwasher and microwave safe. This BPA-free feeding bottle is recommended for newborn babies and young infants. The pack has 3 baby feeding bottles with nipples and a nipple brush.