The natural way to bottle feed. Philips Natural teats help to make bottle feeding more natural for your baby and you. The teat features an innovative petal design for natural latch on similar to the breast, making it easy for your baby to combine breast and bottle feeding. Philips AVENT Natural teats are designed to fit all bottles in the AVENT Natural range (if you have AVENT Classic bottles, these are compatible with teats in the Classic range). The AVENT Natural teats are interchangeable, and available in different flow rates--newborn, slow, medium and fast flow. Once baby moves up to the next teat stage, the old teat can simply be replaced with the new. Slow Flow (1 month+) Medium Flow (3 months+) Fast Flow (6 months+)