Polypropylene bottles are BPA Free Patented internal vent system created by Dr. Craig Brown eliminates the vacuum and air bubbles to help significantly reduce colic, spit-up, burping and gas Fits all of the existing Dr. Brown's standard nipples Works with all of the existing Dr. Brown's convenience accessories including microwave sterilizer, drying rack and dishwasher basket 4-ounce standard size

18.98