With its unique, research-based design, Calma nipple and milk bottle allow your baby to use the same breastfeeding behaviour he learned at the breast, encouraging breastfeeding and reducing the chance for nipple confusion. Includes one nipple and breast milk bottle. For ages 0 to 48 months. Your baby dictates the flow of milk. Unique air-control system and vented nipple help to avoid gassiness. Does not interfere with breastfeeding. Lets your baby feed the way they learned at the breast. Switching from breast to Calma nipple and back easy. The size and length of the Calma nipple are based on research and meet the needs of newborns and toddlers alike. Plastic/silicone. Hand wash. Made in Switzerland. SPECIFICATIONS. Bottle capacity: 150ml.2.75"W x 7.5"H x 2.75"D