Every baby develops an individual and specific feeding behavior whilst on the breast. During breastfeeding, a baby suck, pauses and breathes in his/her own rhythm. Milk flows best, when baby creates a vacuum. But conventional bottle-feeding technique is different from breastfeeding and finding the right solution to feed expressed breast milk can be a challenge. Medela Calma uniquely delivers milk to the baby only when a vacuum is created, and stops the flow when the baby relaxes to pause and breathe. Thus the baby’s natural feeling behaviors can be maintained and switching from breast to Calma and back again has never been easier.