Introducing Dr. Brown’s Options: The market’s 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 Baby’s 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. Easy to grip! Easy to Sip! Dr. Browns Milestones Sippy Bottle with Handles is the perfect first step from bottle to cup. Introducing a sippy spout has never been simpler the soft silicone sippy spout is used in place of a nipple on the Dr. Browns bottle that baby is already familiar with. Easy-grip silicone handles are removable and fit most narrow bottles, while the snap-on cap keeps the spout clean when on the go. Sippy spout fits any Dr. Browns Standard/Narrow Options bottle after vent is removed. All parts are sterilizer and dishwasher safe (top rack).