Can I add essential oils to my toddler's humidifier?

It is best not to add oils directly into the water tank of a humidifier, as this can damage the device or be too potent for a young child. If your humidifier is specifically designed with a built-in essential oil tray, you may use it there, but otherwise, plain steam is the safest and most effective option for easing congestion. Always prioritize safety and consult your pediatrician if your toddler's cough is persistent or severe.