Created by a physician, Dr. Brown's Natural Flow baby bottles feature a patented internal vent system that helps reduce colic, spit-up, burping and gas. Level 4 Y-Cut Nipples are ideal for babies 9+ months. Set includesTwo replacement silicone nipples, exclusively for Dr. Brown's Natural Flow Standard baby bottles. Features: • The positive pressure design allows babies to feed comfortably, because the vent system eliminates the air bubbles and vacuum• Ideal for thicker liquids• All of our nipples are super-soft, made of high-grade silicone• All parts are dishwasher safe
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