Children under 5 years of age with flu and fever are at high risk of complications such as severe pneumonia and febrile convulsions. They should be closely monitored, seek medical attention as soon as possible and treated with antiviral medication as soon as possible. For children of other ages and those with common colds combined with fever, if there are no complications, they can be isolated at home, rest in bed, drink plenty of water, pay attention to opening windows and ventilation, and use physical methods such as warm water wipes or antipyretic drugs to lower their body temperature.