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Dr. Brown's Natural Flow Starter Kit with standard bottles includes one 8 oz. bottle, one 4 oz. bottle and two Level 2 nipples. Dr. Brown's bottles feature a patented internal vent which reduces air bubbles and helps to prevent fluid in your baby's ears. Bottles are compatible with breast feeding, and they help colicky babies settle down and sleep. They also reduce colic, spit-up, burping and gas and are easy to clean. Dishwasher safe.