The Dr. Brown's Wide-Neck Options+ Blue Rainbows Bottle is designed for a smooth transition from bottle to sippy cup. This 9 oz (270 ml) bottle features a wide neck for easy filling and cleaning, and comes with a medium-flow nipple and a super soft silicone sippy spout. The unique vent system helps create vacuum-free feeding, reducing colic and gas. Made from BPA-free plastic, this bottle is dishwasher safe, making it convenient for busy parents. The playful blue rainbows design adds a cheerful touch to feeding time.