Dr. Browns prevent butterfly pacifier 6-12 months - blue prevent orthodontic pacifier designed by a pediatric dentist has a patented suction-free air channel that helps reduce suction and palatal pressure. The soft, suction-release bulb spreads wider as baby sucks for low pressure comfort. Prevent helps to lower the pressures that can create dental issues, such as crossbites. The thin-stem design is minimally instrusive on babys mouth. Stage two is for babys 6-12 months.