Dr Brown's Options+ Anti-colic Baby Bottle provides a comfortable feeding experience for baby from nipple to base, easing the transition from breast to bottle and back again. Starting at the top, the NEW breast-like nipple shape is curved properly for a proper latch and a more natural bottle feeding experience - ideal for switching from breast to bottle and back! Each nipple is designed to provide the same constant, natural flow in every feeding, so you and your baby know what to anticipate. They provide a trustworthy and trusted bottle feeding experience when combined with the anti-colic internal vent mechanism, making Dr. Brown's the #1 doctor recommended bottle in the United States.