Wide Base Design: The nipples have a wide base, which provides a more natural and comfortable feeding experience for babies, mimicking the shape of the breast. Slow Flow: These nipples are designed for slow flow, making them suitable for newborns and younger infants who are still developing their feeding skills. Compatibility: The nipples are compatible with wide base collars. They can be used with Medela bottles that have wide base collars or can be purchased separately as part of the Wide Base Collar Lid Set. Easy Cleaning: The nipples are easy to clean and can be washed in the dishwasher, sterilized using a Micro-Steam bag, boiled, or washed by hand. BPA-Free: All parts that come into contact with breast milk are made without BPA, ensuring the safety of your baby. Overall, the Medela Wide Base Teat Slow Flow 3 Pack provides a reliable and safe feeding option for newborns and infants, with a focus on convenience and ease of use for parents.