3 months old baby occasionally cough a few times, if the foreign body stimulation, dry air, wet and cold, etc., is a normal phenomenon; if the cold, bronchitis, etc. caused by coughing, you need to consult a doctor in time for treatment. 1. Non-pathological conditions: cough belongs to the body’s defense mechanism, can help discharge airway foreign bodies, secretions, etc., so when the baby inhaled milk, hair and other foreign objects may cause irritation choking, low environmental temperature, dry air may also stimulate the airway triggered by coughing, if the baby’s spirit, appetite is good, there is no need for special intervention. 2. Pathological conditions: when the baby has a cold, bronchitis and other respiratory infections, airway secretions will increase stimulation triggered by coughing, generally accompanied by runny nose, fever, shortness of breath, decreased milk, mental instability and other symptoms, if the combination of bacterial infections need to comply with the doctor’s orders to use medication, such as cephalexin. The baby occasionally cough, parents can not judge, it is recommended that timely medical treatment, to avoid causing adverse consequences.