Pack Contents: This set includes 3 wide base medium-flow silicone nipples, providing an ample supply for your feeding needs. Size: Designed for babies aged 4 to 12 months, making it suitable for infants transitioning to medium-flow nipples. Compatibility: These nipples can only be used with wide base collars. Consider purchasing additional Wide Base Collar Lid Sets for extras. Easy Cleaning: The nipples are easy to clean and maintain. They can be washed in the dishwasher, micro-steamed, boiled, or washed by hand, ensuring hygiene and convenience for parents. BPA-Free: All parts that come into contact with breast milk are made without BPA, prioritizing the safety and health of your baby. Additional Information: For more details on breastfeeding duration recommendations by the World Health Organization (WHO), you can visit www.medela.com/who. Overall, the Medela Wide Base Teat Medium Flow 3 Pack offers a reliable and safe feeding solution for your baby, backed by Medela's commitment to research and innovation in infant care.