The First Years Soothie bottle uses the shape of the Soothie pacifier for familiarity when transitioning to the bottle. Using their stage one nipple for slow to medium flow, the bottles are perfect for babies getting comfortable with bottle feeding. The bottle covers snap to the bottom of the bottle, and the wide neck makes filling and cleaning a snap, and the contoured shape makes it easy for the baby to hold. The bottles work with all First Year breast pumps, and it is also nice that they do not contain polyvinyl chloride (PVC) or phthalates. The First Years Soothie three pack includes three 5 ounce bottles and bottle covers and three stage one nipples. Bringing the hospital distributed Soothies Brand to bottles! Same nipple shape and feel as the 2.5 million hospital-distributed Soothie Pacifiers for easier transitioning for baby. Medical-grade silicone. Cover snaps on to bottle base so it doesn't get lost on the go. Bottle features a medium/fast flow. Soothies is a brand recognized by moms as trusted by hospitals, and we have used the same medical-grade silicone as the pacifiers. Home-use testing has shown us that 75% of moms were able to successfully transition baby from breast to the Soothie Bottle System, and all believed that it was because the bottle had the same shape and feel as the pacifier, making it easy for baby. 80% of moms reported that their baby took the bottle on the first or second try!