calma teats x2 medelacalma teats x2 medela With Calma, the milk will only flow if the baby works and creates vacuum to remove the milk. This enables the feeding behavior learned at the breast to be used with Calma. Features & Benefits Vented nipple: Helps avoid gassiness as the bottle is vented through our unique air control system Mimics natural feeding behavior: Supports easy transition from bottle to breast. Research has shown that with Calma, your baby is able to