Complete your tiny tot's feeding system with these Dr. Brown's standard nipples. The consistent flow rate helps your little one feed comfortably, and a convenient design works with the Dr. Brown's internal vent system to help prevent colic and potential tummy trouble. High-grade silicone construction provides lasting use and a super-soft texture to mimic the feel of skin. These Dr. Brown's standard nipples are BPA-free for peace of mind and are safe for use in bottle sanitizers for easy cleaning | Dr Brown's Natural Flow Nipples Level 4