A bottle that has been created by experts in pediatrics and orthodontics, designed for healthy bottle feeding in combination with breastfeeding. The innovative Zero Zero bottles have an inner silicone bag. This patented silicone bag is stretched during feeding depending on how the baby sucks, similar to what happens in the mammary glands of a nursing woman. This innovative system causes no air bubbles in the food, so the baby does not swallow air, which could cause colic. This system also prevents oxidation of the milk and the loss of important nutrients. The Zero Zero bottle nipple is made of silicone. Thanks to a design based on scientific research, this teat resembles the shape and texture of the mother's breast like never before. For this reason, there is not that much of a difference between a pacifier and a nipple for the baby, and he or she easily transitions from bottle-feeding to breastfeeding and vice versa. Medium Flow: Passes through all types of medium density liquids. Ideal for milk, water and very liquid porridges.