Playtex Nurser Drop-Ins Disposable Liners – 4 oz (118 ml), 50-Count Anti-Colic LinersMake feeding time cleaner, easier, and more comfortable with Playtex Nurser Drop Ins Disposable Liners. Designed to work seamlessly with Playtex Baby Nurser Bottles, these pre sterilized liners collapse naturally as your baby feedshelping keep air out of the milk and reducing gas, colic, and fussiness. Each liner contracts to mimic the natural motion of breastfeeding, creating a feeding experience that feels more familiar and soothing for your baby.