The first and only unique Nuby Multi-Flow No-Spill Nipple is designed to prevent leaks and spills. The cross-shaped slit allows liquid to flow into the nipple only when the baby is sucking. The slit closes when the baby stops sucking, preventing leaks. The air valves of the nipple help prevent air swallowing and the occurrence of "infant colic" . The special surface of the patented Nuby nipples gently massages the baby's gums, helping teething. Peculiarities: From birth spill-proof cup Air valve Multistream Cones (nubs) for gum stimulation Care: Wash and boil teats and bottles before use. Warning: All nipples can wear out. Any nipple should be tested for cracks by pulling on the nipple. Check and replace the nipple if it becomes sticky, stretched, cracked, or shows other signs of wear. Do not allow your baby to take the bottle to bed or leave him or her alone for long periods of time while feeding. Prolonged use of milk, formula, juice, or sugary drinks may cause dental problems. Consult your pediatrician for the best feeding method. Never put carbonated drinks into the bottle; the pressure may cause leakage. Never leave your baby alone while using this or any other baby product. Always check the temperature of food before feeding. There are 2 pcs in a package . Composition: silicone. The product is made of safe, durable, non-toxic materials. Certified in Russia. Meets all GOST and SanPiN requirements.