This 4-pack MAM bottle nipple bundle includes 2 medium flow level 2 nipples and 2 fast flow level 3 nipples, providing a range of flow rates suitable for newborns and older babies. Both nipple types feature MAM's unique flat, symmetrical nipple shape designed to resemble a mother's breast for easy switching between breast and bottle feeding. The medium flow nipples deliver formula or breastmilk at a steady pace to satisfy the needs of babies 2 months, while the fast flow nipples feature a higher flow rate for 4 month old babies. All the BPA-free silicone nipples have an air valve to prevent collapse and allow comfortable pacing. With their soft, skin-like texture, 94% of babies accept these MAM nipples that perfectly fit all MAM baby bottles. The smaller mouthpiece and symmetrical shape also provide an ideal fit for little mouths. This multi-flow nipple bundle covers evolving feeding needs in the first year to help make bottle feeding more like breastfeeding.