Newborn digestive systems are not perfect that's why Dr. Brown's created the Options bottles. Options bottles come with an innovative internal vent system that has been proven to reduce colic, preserve nutrients and reduce feeding and digestion problems. To give parent the most options, this bottle can be used with or without the vent system. The nipple venting creates a paced flow, and provides a feeding experience similar to most nipple-vented bottles. Options bottles are BPA-free.