This is a Dr. Brown's PreVent Pacifier, specifically designed for babies aged 6-12 months. Design: It features a patented suction-free air channel and a thin bulb stem, developed by a pediatric dentist to help reduce pressure inside the baby's mouth and potentially prevent dental issues like posterior crossbite. Material: The pacifier bulb is made of 100% silicone. Features: It is designed with a fully symmetrical soother for reversible positioning and a unique shield to reduce irritation by allowing the baby's skin to breathe. Availability: These pacifiers come in various designs and stages, including options like "Prevent Classic" and "Butterfly Shield".