Babies are our business. Nursers Gerber Care: Sanitize nipple prior to first use by placing in an open pan of boiling water for 2 minutes. Clean all parts with hot water and mild detergent, or use top rack of dishwasher. Heating: (DO NOT OVERHEAT): Place under hot running water or place in a container of heated water. To Microwave: Remove nipple, collar and hood from nurser. Place filled nurser in microwave. Microwave at 10 second intervals. Replace nipple and collar. Invert nurser and check temperature on wrist after each interval. Uses: Provides a shatterproof, sterilizer safe plastic. Ribs and vent holes help prevent nipple collapse and ensure smooth flow of liquids. All rubber nipples can wear out. To prevent a possible choking hazard, test strength by pulling on bulb portion before each use. Inspect and replace if nipples become sticky, enlarged, cracked, torn or show other signs of excessive wear. Do not allow baby to take bottle to bed or self-feed for long periods. Extended contact with milk, formula, juice or other sweetened liquids may cause severe tooth decay.