If you are switching your baby from the bottle back to breastfeeding, you need Calma. This bottle was developed specifically with the goal of prolonging the mother and baby breastfeeding bond. With this bottle, your baby can feed more naturally, pausing when they like just as they would when breastfeeding. It’s your baby that controls the flow of milk, not the bottle. When your baby sucks, the milk flows into their mouth, but it stops when they stop. The quality nipple is vented for optimal release of milk, but the entire unit can be turned upside down without dripping. Transition easily from bottle to breast with Calma.