Four-month-old baby blowing the air conditioning cough, may be cold air stimulation, allergies, cold and flu and other causes, according to the cause of the targeted treatment, such as regulating the appropriate temperature, to avoid contact with allergens and so on. 1. Cold air stimulation: the baby’s constitution is relatively weak, by the air conditioning cold air stimulation, may cause coughing symptoms, usually air conditioning as much as possible to choose the appropriate temperature, and can not blow directly on the baby. 2. Allergy: the baby may be allergic to dust mites, dust, cough symptoms, parents usually pay attention to do a good job of air conditioning cleaning, if necessary, hospital visits to clarify the allergens, life, pay attention to avoid contact with allergens. 3. Cold and flu: long time indoor environment temperature is low, the baby may be cold and flu, will also appear cough symptoms, pay attention to avoid the temperature is too low, do a good job to support the treatment; if the baby combined with bacterial infections, need to comply with the doctor’s advice to use penicillin and other antibiotics for anti-infective treatment. Four-month-old babies are physically weak, try to avoid indoor temperature is too low, not to mention air conditioning blowing directly, in order to avoid coughing symptoms. If the baby’s symptoms are not relieved for a long time, parents should take the baby to the hospital for a clear diagnosis, and follow the doctor’s instructions for targeted treatment, so as not to miss the opportunity for treatment. Drugs need to be used under the guidance of a doctor.