Nipple specially designed to ensure natural development of teeth and gums. Pacifiers are suitable for sterilizing by means of a Philips Avent steam sterilizer or boiling in water for at least 5 minutes. After sterilization please allow nipple to cool for at least 5 minutes and remove any trapped water before use. Important: Avent pacifiers are available in sizes ranging from 0 to 18 months. For your child's safety, always follow age guidelines accordingly.