Playtex baby drop-ins liners for nurser bottles are perfect for the busy mom-on-the-go, providing benefits that mom and baby will enjoy. These disposable, pre-sterilized liners makes the bottles easy to use and clean, and provide a comfortable feed for baby. As baby feeds, you can see the soft liner gently collapsing to prevent air from mixing with milk and getting into baby’s tummy. This means less gas and less discomfort for baby. Playtex baby drop-ins liners for nurser bottles work with all playtex nipples to match baby’s unique preferences. Used by generations of moms for a feeding uniquely designed to mimic breastfeeding. Always bpa free. Gender: unisex.