The Medela Calma is designed exclusively as an alternative to breastfeeding for mums wishing to feed their babies with breast milk. Calma allows your baby to suck, swallow and breathe just as they learned on the breast. Calma teats help the baby to avoid swallowing air during the feed, as they are regulated by a unique venting system. Made in Switzerland, from BPA-free materials. Available in two sizes – 150ml/250ml.