Calma is a feeding solution designed for breastfed babies. It does not interfere with breastfeeding, and lets your baby feed in a similar way that it learned at the breast.  The Calma method is just like breastfeeding, because your baby: Can drink, pause and breathe in a natural rhythm, remaining calm and settled, just like on the breast Needs to create a vacuum to start the milk flow, just like he/she does while breastfeeding Continues its natural way of sucking, allowing an easy transition from breast to Calma and back to breast again Calma helps the baby to avoid ingesting air during the feed with a specially designed venting system. While the principle of venting is similar to other teats, Calma is regulated by a venting system that works every time, regardless of how tightly it is secured to the baby feeding bottle. Babies will be more likely to feed calmly, in their own natural rhythm. The teat can be used with all Medela breastmilk bottles. Calma Solitaire is easy to assemble and clean. It comes with 2 multi-lids that prevent spills and close the bottle tight, plus a protection cap. Suitable for 0mths+