Usage Directions / Dosage: To Clean Latex Nipples: Boil nipples for five minutes before first use only. Do not boil thereafter. Simply wash in hot, soapy water after each use for about one minute and rinse thoroughly. Do not place nipples in steam sterilizers or dishwashers. PositiWarnings/Caution: All natural latex can weaken after 2-3 months of normal use and should be replaced. To prevent a possible choking hazard, test strength regularly by pulling hard on stem. Inspect nipple regularly, especially when baby is teething. If nipple becomes sticky