Philips Avent Natural Response Bottles is a pack of three wide-neck 125ml/4oz baby bottles equipped with Natural Response Nipples. The Natural Response Nipple releases milk only when the baby actively drinks. Babies can drink, swallow and breathe using their natural rhythm, like on the breast. Making it easy to combine breast and bottle feeding! Comes with Flow 2 Nipples (0M+). Wide-neck bottle (4oz/125ml) Comes with Flow 2 Nipples for 0M+ babies A nipple that works like a breast Nipple releases milk when baby actively drinks Natural latch on with breast-shaped nipple Designed to reduce colic and discomfort No-drip nipple design prevents spills and lost milk Easy to hold even for little hands Simple to use, easy to clean and quick to assemble Made of BPA free* material ( Purchase extra Natural Response Nipples here ). Recommended for 0M+ Recommended for Flow 1 0M Flow 2 0M+ Flow 3 1M+ Flow 4 3M+ Flow 5 6M+ Purchase extra Natural Response Nipples here Specifications: Bottle Polypropylene BPA free* Nipple Silicone BPA free* Click here for product manual