Dr. Brown’s Natural Flow Baby Bottles are a tried and tested favorite with parents focused on helping their little ones experience happy feeding. Helps reduce feeding problems: Our bottles are known for reducing colic, spit-up, burping and gas. Helps preserve bottle milk nutrients: Vitamins C, A, and E are critical for health in infancy. Vacuum-free feeding helps digestion: Good digestion is essential for babies, particularly newborns. Fully-vented bottle design: Closest to breastfeeding. Internal Vent System and silicone nipple work together: Controlled flow so babies feed at their own pace.