Type: Nipple Material Properties: PVC Free, Nitrosamine Free, Rubber Free, Phthalate Free, BPA Free Style: S small hole, M middle hole, L big hole, X does not suck, not shedding Size: S / M / L / X Flow Velocity: S, M, L flow, can flow naturally, the larger the hole, the more flow, X does not suck, does not flow Mouth size: wide neck teat Material: Silica gel Packaging: in bag Baby nipple feeder: baby feeding Baby Safety: Baby Care Baby products: Baby feeding bottle accessories Type: Cork Tips: X does not suck, does not flow ; S, M, L will flow naturally, please choose according to the age of the baby Sterilized with hot water before use. The nipple should be changed every 20 days to 30 days. Suggest buying more than 5 at a time