Compatible with Ember baby bottles, sold separately Level 1 bottle nipples deliver a low flow rate that's suitable for newborns and up Food-safe, BPA-free silicone construction ensures durability and parental peace of mind Top-rack dishwasher-safe bottle nipples are easy to clean Safe for sterilization in your sterilizer or in boiling water Flow rates are printed directly on the nipple for at-a-glance checking