The nipple only releases milk when the baby drinks. The Natural Response Nipple adapts to your baby's natural feeding rhythm, making it easy to combine breastfeeding and bottle feeding. The nipple has a unique hole that releases milk only when baby drinks. So when baby pauses to swallow and breathe, the milk flow stops. Designed to reduce feeding problems The AirFree vent is specially designed to provide additional protection against feeding problems, as it prevents air from entering your baby's tummy during feeding in an upright position. Easy to use and clean and quick to assemble Wide neck makes it easy to fill and clean the bottle. With only a few parts, for quick and easy assembly, as the AirFree vent is a single piece. Natural Response nipples and bottles are BPA-free* Philips Avent Natural bottles and nipples are made of BPA-free* material. Medium flow nipple - Breastfeeding-like milk flow, which reduces problems It offers calm and comfortable feeding. The Natural Response nipple supports baby's unique rhythm, while the AirFree valve is designed for extra protection against colic, gas and reflux. Non-drip nipple design helps prevent leaks and milk loss The nipple hole is specially designed to release milk only when the baby drinks. So you can be sure that you will not have any milk loss both at home and while on the go. Easy to hold, even for your baby's little hands The bottle's ergonomic design makes it easy to hold at any angle for maximum comfort during feeding. Easy to hold, both for you and your baby's little hands Natural grip with a nipple shaped like a female breast The wide, soft and flexible nipple is specially designed to simulate the shape and feel of a woman's breast, making it easier for your baby to latch on and feel comfortable.