Dr. Brown's Natural Flow bottles help maintain vitamins C, A, & E, use positive-pressure feeding, and help reduce colic. BPA free
1 - 4 oz Standard BPA free Bottle
1 - Level-one silicone nipple
1 - Two piece patented internal vent
1 - Cleaning Brush
The patented Natural Flow internal vent system is the only vent that eliminates the vacuum and the air bubbles found in most baby bottles. It allows air to enter through the nipple collar without being incorporated into the breast milk or formula.