Before first use, sterilize the bottle, teat, and all components. After each use, clean thoroughly with warm soapy water and rinse well. Assemble the bottle according to the instructions, ensuring the teat is securely attached to the bottle ring. Pour the desired amount of milk or formula into the bottle, being careful not to overfill. Hold the bottle at an angle to ensure the teat is always filled with liquid, which helps prevent your baby from swallowing air. Store any remaining milk or formula in the refrigerator and consume within the recommended time frame.