The Avant Contemporary Free Flow Pacifier (3-6 Mo's) Are Designed With The Highest Safety Standards, AVENT Pacifiers Have Odorless, Tasteless Silicone Nipples That Reduce Risks Related To Allergies. As Recommended By Pediatricians, The Nipple Is Symmetrical, So Right Side Up Or Upside Down, AVENT Pacifiers Ensure The Proper Development Of Your Baby's Teeth And Gums. The Vents In The Shield Allow Circulation, Which Helps Prevent Chapping And Protects Your Baby’s Delicate Skin.