PHILIPS AVENT Natural Feeding Nipple, Slow Flow 1M+, 2 pk, Philips AVENT NEW Natural Nipples are designed to help babies feed from both the breast and the bottle. The nipple's wide shape is similar to the shape of a breast, and its soft, rounded nipple encourages the same peristaltic movements used to breastfeed. Twin anti-colic valves keep air in the bottle and out of babies' tummies, making feeding more comfortable, thereby reducing colic. The nipples are made of soft, durable silicone and have a unique petal design that prevents nipple collapse while your baby feeds. Wide Nipple Encourages Natural Latch-On The wide, breast-shaped Natural Philips AVENT newborn-flow nipple helps you combine breastfeeding and bottle feeding. Its natural shape promotes easy latch-on so your baby can feed contentedly and without interruption. The nipple's shape encourages the same tongue movements suckling babies use when breastfeeding, so transition between the two is less confusing for your baby. The newborn-flow nipple offers the slowest flow rate and is designed for the youngest babies. Twin Anti-Colic Valves Make Feeding More Comfortable The Natural nipples have twin anti-colic valves that work to make feeding more comfortable for babies. During feeding, the valves release air back into the bottle rather than into your baby's tummy, which reduces colic and discomfort. Comfort Petals Make Nipple Softer and More Flexible Built-in unique comfort petals make the nipple softer and more flexible to promote natural latch-on. The petals also reinforce the shape of the nipple to keep it from collapsing in your baby's mouth so your baby can feed without interruption. Durable Silicone Is Soft and Easy to Sterilize These nipples are made of soft, durable silicone, which is odorless and flavorless.