Great for newborns, Dr Brown's 120ml baby narrow bottles With Options are BPA free and use a natural flow design to reduce baby wind and gas. It is the first convertible bottle that can be used with or without the vent system. The Natural Flow vent design used in Dr Browns bottles allows your baby to nurse without fighting the negative effects of a vacuum or the discomfort of ingesting air bubbles. This helps relieve suffering from an upset tummy, colic, excessive wind or gas, or spit-up. The free flow of milk from the positive pressure at the nipple also eliminates nipple collapse, and can help reduce the build up of fluid in baby's ear. Some parents find removing the vent a convenient option as their baby's feeding becomes more developed. Both the baby bottle and Natural Flow vent system are made from baby safe BPA free polypropylene plastic. The vent system is also easy to clean as it can be quickly removed and separated, and comes with a complementary 'pipe cleaning' brush for thorough cleaning. Dr Brown's 120ml baby narrow bottle With Options includes: 1 BPA free 120ml baby bottle 1 level 1 teat (suitable for 0-3 mths) 1 teat collar (works with all levels of teat) 1 Removable anti-colic vent system 1 cap to keep the teat clean (not a travel cap) 1 vent cleaning brush and instructions Consider buying level 2 & 3 teats at the same time for the faster milk flow your baby will need as they grow.