Medela’s Calma Nipple is made for easy switching between bottle and breast and exclusive breast milk feeding. Vented design and flow control valve encourage seamless transition from bottle to breast, while allowing your baby to pause, breathe, and feed as needed and as he or she naturally would when nursing at the breast. Engineered to replicate natural feeding patterns and mechanics when nursing, milk flows through the Calma nipple after a vacuum has been established. What’s Included: (1) Calma Nipple, compatible with all Medela bottles; (1) Cap; (1) Lid This breastfeeding bottle nipple can be used through all stages of your breast milk feeding journey – whether your newborn is only a few weeks old or is nearing their six-month birthday, you can use this nipple to continue feeding your baby breast milk for as long as you choose. Additionally, the Calma nipple is made without BPA, just like all other Medela breast milk bottles and products that come into