Baby cold, daytime does not cough, cough at night, because the baby by the invasion of pathogens, pathogens in the baby’s body inflammatory reaction. Inflammatory response is mainly manifested in the baby’s respiratory mucosa congestion, edema, and even inflammatory substances exudate, inflammatory substances can stimulate the baby’s respiratory tract and cause coughing and even coughing phlegm. At night compared to the daytime baby’s sympathetic nerve will be much more excited, easy to enhance the respiratory secretions, so that secretions increase, aggravate the stimulation of the baby’s respiratory tract caused by frequent coughing at night. At this time, we should pay attention to timely take cough and phlegm symptomatic treatment, can be oral medication, can also be combined with nebulizer inhalation therapy to reduce the baby’s symptoms.