Philips Avent Natural baby bottles support your baby s well being while helping you care for yourself. The Natural Response nipple lets your baby control the milk flow, releasing milk only when actively drinking just like breastfeeding. When your baby pauses, the flow stops. The soft, wide, flexible nipple mimics the breast to support easy latch and smooth switching between breast and bottle. A no drip design helps prevent spills, and the built in anti colic valve sends air away from your baby s tummy. The ergonomic shape is easy to hold, and wide openings make filling and cleaning simple. Made from Bpa free polypropylene, the bottle works with all Natural Response nipples. Babies may need a few tries to learn the flow, and different nipple flow rates help match your baby s feeding rhythm.