Dr. Brown's PreVent Butterfly Pacifier 0-6 months - 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 intrusive on baby's mouth. Stage One is for baby's 0-6 months.