Three-month-old babies cough is a relatively common phenomenon, cough is a protective reflex, through coughing to protect and clean the respiratory tract, the secretions out of the body, but different symptoms have different ways to relieve. 1, cough with phlegm and not accompanied by other cold symptoms. This is due to the baby’s respiratory secretions more, may also be snot more backflow into the pharynx stimulation caused by coughing, may also be pharyngeal inflammation, to distinguish the cause of treatment. 2, if it is a dry cough, to consider is pharyngitis or allergic cough, there are some infections will also be dry cough in the early stage, and then gradually phlegm. Should observe whether there are other accompanying symptoms, pay attention to record the baby’s temperature, if the symptoms are still not improved, need to take the child to the hospital immediately to check the lungs, blood routine, etc., during the period to avoid taking the child to crowded places, pay attention to keep warm. 3.Occasional cough does not affect normal life. You can slightly massage the baby’s back to maintain smooth breathing. Do not give your child blind medication, or blindly add or reduce the baby’s clothes, to maintain the temperature and humidity in the room, to give your baby a comfortable environment. Infant cough is caused by different factors, we must understand the cause and then take measures to treat the symptoms, the symptoms are not relieved must immediately take the baby to the doctor, follow the doctor’s advice.