Humidifiers add moisture to the air, which helps ease coughing and congestion due to a cold. Young children commonly get about 6 to 8 colds and upper respiratory tract infections each year. Increasing the air moisture is a common way to help your child feel better when he/she is congested and for other cold symptoms. For their safety, always use cool-mist humidifiers for children.
In general, a cool mist vaporizer or humidifier is preferred over a warm mist one because of the risk of your child getting accidentally burned. A cool mist humidifier can be especially helpful for kids that have croup.