With calma, a baby can finally apply the same feeding behaviour learned at the breast, when consuming expressed human milk. This allows for seamless transition between breast and calma, eliminating nipple confusion.just like when breastfeeding, baby latches onto the teat of calma by creatinga vacuum. Once the vacuum has been established, the baby uses his or hertongue to increase or decrease the level of the vacuum. When the vacuum isat baseline, milk will not flow through calma. However, when a baby increasesthe level of the vacuum, calma allows the milk to pass through the teat intothe babys mouth.features:milk flow hole: milk flow membrane system ensures milk stays in the bottle until the baby chooses to feed by increasing the level of vacuumsoft bumps: the soft bumps stabilize the outer layer and prevent the silicone from collapsingair venting system: ensures bottle air pressure remains neutral at all times so milk release is dependent only on level of vacuum created by baby.