FULLY VENTED TRADITIONAL    (Unvented or partially vented) A fully vented baby bottle allows an exchange of air and liquid without the two coming in contact and without establishing a vacuum. When feeding, air is routed from the bottle collar directly through an internal venting tube that surpasses the liquid. An unrestricted flow of the liquid is present for baby as the internal vent tube prevents aeration of the breast- milk or formula. Babies feed without ingesting air in the breastmilk or formula and without sucking against vacuum pressure. When feeding with a traditional bottle, a baby’s natural nursing motion creates a vacuum and generates air bubbles. Without an internal venting tube, the air goes through the nipple directly into the liquid, aerating the breastmilk or formula. As the baby feeds, the vacuum pressure builds which produces more air bubbles in the liquid. Air bubbles have now been proven to cause nutrient degredation in breastmilk and formula.