Usage Directions / Dosage: For best performance, use only Playtex Drop-Ins Pre-Formed Soft Bottle Liners with nursers. Easy to Use: To Dispense - 1. Turn package so patented easy-to-use dispenser tab is at bottom. 2. To open, push in and pull down dispensing tab along perforations. 3. To dispense, pull down a single pre-formed liner. 4. To reseal package, insert tab into slot. To Use with a nurser - 1. Place Drop-Ins Soft Bottle Liner into nurser. 2. Pour liquid into liner. 3. Pull nipple through retainer ring to ensure a proper seal. 4. Screw retainer ring onto nurser and tighten securely. 5. Discard liner after a single use to ensure a fresh, clean bottle at every feeding. Note: Do not allow sharp objects such as fingernails or rings to come into contact with the liner. Warming Instructions: Either - A. Warm liquid in the assembled nurser by placing nurser under hot tap water or in a pan of warm water removed from the heat source. Or B. Before pouring into assembled nurser, warm liquid in separate container and cool to lukewarm. (At least 15 minutes if boiled). Always test liquid temperature on inside of wrist before giving to baby.