Make bottle feeding smooth and comfortable for your growing baby with the ultra-soft, fast-flow Optimal Liquid Silicone Nipple. KEY FEATURES: ‣ Made from 100% Liquid Silicone: Super soft and flexible for a natural latch and comfortable feeding experience. ‣ Ideal for babies 6 months and older who are drinking more and with greater suction strength. ‣ Anti-Colic Valve - Helps reduce air intake, minimizing gas, spit-up, and fussiness.