This 4-pack nipple bundle from MAM includes both medium flow level 2 and fast flow level 3 silicone nipples, providing options 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 bottle and breastfeeding. The nipples fit all MAM baby bottles. The medium flow nipples have an air valve to prevent nipple collapse, allowing newborns to feed at a comfortable pace. The fast flow nipples deliver formula or breastmilk quickly to satisfy older babies' appetites. Both nipple types have ultrasoft BPA-free silicone with a skin-like feel for easy acceptance - 94% of babies accept these nipples. With multiple flow rates in one convenient bundle, you can cover feeding needs at different infant ages and stages. The medium flow nipples are ideal for newborns transitioning from breast, while the fast flow satisfies older babies' higher intake needs. Together, these bottles simplify bottle feeding for parents.