<p><strong>Exclusively for Dr. Brown's Natural Flow baby bottles</strong></p><p>Made of super-soft, high-grade silicone, each nipple level provides a different flow rate.</p><p>All of these bottle nipples vary in size and shape. From the Preemie Flow nipple, which limits the flow to tiny mouths to the Y-Cut nipple which literally utilizes a "Y"-shaped opening to allow for greater milk flow, youll find the bottle nipple thats the perfect fit for your babys feeding needs.</p><p><strong>One size does not necessarily fit all.</strong></p><p>Keep in mind that the Bottle Nipple Chart serves as a general guideline for choosing a bottle nipple but is by no means an end-all solution. It is important to carefully watch the feeding habits of your little one. For instance, is your three-month-old not seeming to get enough from the bottle at feeding time? Moving her up from a Level One to a Level Two bottle nipple may be in order. Adapt your bottle nipple selection to match your babys feeding style, regardless of age.</p><p><strong>Size Chart:</strong></p><ul><li>Preemie Flow - For Preemie Babies</li><li>Level One - For Newborns 0+ months</li><li>Level Two - For Babies 3+ months</li><li>Level Three - For Babies 6+ months</li><li>Level Four - For Babies 9+ months</li><li>Y-Cut - For Babies 9+ months</li></ul><p> </p>