The Closer to Nature range has been developed with breastfeeding experts and moms to mimic the breast's natural flex, stretch and movement. The soft silicone nipple feels like skin, and gently elongates and flexes during feeding to mimic natural breastfeeding action. The Closer to Nature Newborn Essentials Set includes a special selection of Closer to Nature products including 2 x 9oz Feeding bottles (with Slow Flow Nipples), 2 x 5oz Feeding bottles (with Slow Flow Nipples), a First Sips Transition Cup and a Bottle Brush. The Newborn Essentials Set contains all of the bottles and nipples needed to bottle feed a newborn with confidence