A child’s runny nose from clear to yellow indicates that it may be a combination of bacterial infections. Children’s runny noses are mostly related to colds, most of which are initially caused by viral colds, often manifested as runny nose and sneezing, and if the runny nose turns yellow afterwards, it indicates that the condition has changed, suggesting that it is combined with bacterial infections. During this period, parents are advised to give children more boiled water, more intake of vitamin-rich fruits and vegetables, and pay attention to warmth to help the recovery of the condition. Children’s runny nose from clear nasal discharge to yellow nasal discharge may also be related to other reasons, it is recommended to consult a doctor in time to clarify the cause of the disease, if necessary, under the guidance of the doctor to standardize the use of medication, do not unauthorized use of medication.