Dr Brown's 270ML Options Wide Neck Bottles are designed to reduce colic and are also proven to help maintain vitamins C, A and E. The patented internal vent system of Options bottles is the only system that eliminates the vacuum and air bubbles found in most baby bottles. It allows air to enter through the nipple collar without being incorporated into the breast milk or formula. The air is then channelled through the internal vent system to the area above the breast milk or formula. This positive pressure eliminates nipple collapse and can help reduce the build up of fluid in baby's ear. Babies feed more comfortably with the Options system because the vent allows them to nurse without fighting the negative effects of a vacuum or the discomfort of ingesting air bubbles. This helps to reduce colic, spit up, burping and gas. Dimensions:8 x 20 x 5cm. Includes: 1 x Level 1 teat, 1 x Cleaning brush,