SDC is a diaper changing station that utilizes the three states of water for sterilization, including hot water rinsing and steam sterilization, followed by drying. For safety reasons, it remains locked until sterilization is complete. It features a diaper disposal area and storage space to minimize contact between babies and bacteria. Below, there is a water tank connected to pipes for filtration and water recirculation, ensuring a convenient and hygienic experience for users when assisting with diaper changing.