The NUK Orthodontic Wide Neck Silicone Nipple Fast Flow supports a seamless transition from breast to bottle. It has an extra wide base mimics the shape of the natural breast. The hourglass shape allows the lips to close properly making it easier to breathe through the nose and avoid intake of air through the mouth. The flat area reinforces correct position of the tongue for better lower jaw development. The ventilation hole regulates the intake of air and prevent the nipple from collapsing.