Dr. Brown's Natural Flow baby bottles are the only bottles designed by a doctor to help reduce colic, spit-up, burping and gas. Dr. Brown's bottles feature the patented internal vent system, which creates positive-pressure just like breastfeeding. This fully-vented bottle design produces a more comfortable feeding by eliminating the vacuum and excess air ingestion. It's the venting system your baby deserves, in a choice of bottles to fit your lifestyle. Dr. Brown's bottles are also easy to clean and dishwasher safe.

The handy formula level gauge is represented in both ounces and milimeters for accuracy. The Wide-Neck 4 oz. Dr. Brown's Natural Flow Bottle comes with a Wide-Neck Silicone Nipple complete with Nipple Cover and Collar, 2-piece Vent Assembly (snaps together) and Travel Disc. Dr.Brown's Bottles are non-disposable and dishwasher safe which means there's no need to buy expensive liners. Compatible with breast feeding and breast pumps.