Introducing Dr. Browns Options: The markets first convertible bottle that can be used with or without the vent system. The new vent system is designed to grow with baby, and we recommend using this system to experience all the health benefits of our bottle. It helps reduce feeding problems, helps digestion and helps preserve vitamins. Some moms and dads find removing the vent a convenient option as their babys feeding becomes more developed. The nipple venting creates a paced flow, and provides a feeding experience similar to most nipple-vented bottles. Options bottles fit most breast pumps, and are BPA-free and made in the USA. Features: Options Bottle can be used with or without Vent system Helps reduce feeding problems Helps preserve vitamins Helps digestion Vent and nipple create vacuum-free feeding Provides a feeding experience similar to most nipple-vented bottles Nipple venting creates a paced flow BPA Free Contents: 3 - 4 oz/120 ml NARROW baby bottles 6 - Level One silicone nipples 0-3 Months 1 - Cleaning brush -- Included: 3 bottles (4 oz) Made in the USA -- Options Bottle can be used with or without Vent system -- Helps reduce feeding problems - colic, spit-up, burping and gas -- Vacuum-free feeding helps digestion, BPA Free