Sterilize each pacifier before use. Bring water to a boil and pour boiling water over pacifiers. Let the pacifiers soak for approx. 5 minutes. Pick them up and let them dry. The pacifier nipples may retain water, simply squeeze the nipple to release and lay to cool and dry for 3-4 hours. If the pacifier shows any irregularities, we recommend that you discard right away. Due to our pacifiers being made with natural rubber, the nipple may expand with use.