Coughing in 4-month-old infants may be related to choking, stimulation of the surrounding environment, respiratory tract infections and other factors, and the patient can be relieved of the symptoms through general treatment, medication, surgery and other ways. 1. Choking: 4-month-old babies choking caused by coughing, parents need to promptly turn the baby’s face to the side or take the side position, to avoid vomiting into the airway, triggering asphyxia, and promptly clean up the vomit in the mouth, pay attention to observe the baby’s state of mind and respiratory conditions, if there is breathing difficulties or poor mental state, you need to consult a doctor in a timely manner. 2. Stimulation of the surrounding environment: when the surrounding environment air is too dry or the presence of irritant gases, may also cause coughing, parents should pay attention to open windows and ventilation, to avoid long-term inhalation of irritant gases in infants, the environment is too dry, you can use humidifiers to regulate the indoor humidity and so on. 3. Respiratory infections: When infants have upper respiratory tract infections, bronchitis and other respiratory diseases, may also cause coughing, the child should drink more water, can be under the guidance of the doctor to take pediatric phlegm cough granules and other drugs for cough treatment. It is recommended that children strictly follow the doctor’s instructions to use medication, actively cooperate with the doctor’s treatment, pay attention to monitoring the condition in life, such as aggravation of the condition need to consult a doctor in a timely manner.