Health knowledge about indoor environment: The weather in winter is cold and dry, and babies’ immunity is low, making them vulnerable to bacteria and viruses. Therefore, while ensuring indoor warmth, it is necessary to ensure indoor air humidity and ventilation. First, keep the indoor temperature suitable for your baby\’s body and avoid temperatures that are too low or too high to stimulate your baby\’s immune system. Secondly, dry indoor air can lead to uncomfortable symptoms such as dry throat and nasal congestion. Using a humidifier can effectively maintain air humidity. In addition, clean the dust and bacteria in your home promptly to prevent your baby from inhaling harmful substances. You can use an air purifier