There is no most effective way to stop coughing in a one and a half year old baby. May and environmental stimulation, bronchitis, allergic cough and other diseases related to the treatment of the main according to the different causes of the corresponding general treatment, medication and so on. 1. Environmental stimulation: one and a half year old baby due to cold air or abnormal odor and other stimuli may appear cough, pay attention to warmth, keep the indoor air clean, etc. can be relieved, generally do not need special treatment of drugs. 2. Bronchitis: when the baby bronchitis, can also appear cough. If accompanied by more phlegm, you can give Ambroxol nebulized inhalation, to promote the discharge of phlegm. In the symptomatic treatment at the same time, need to clarify the cause of infection targeted treatment. Such as viral infections can be suitable for treatment with oral antiviral solution, bacterial infections can be given antibiotics to fight infection, such as cefixime and so on. 3. Allergic cough: the baby’s immunity is weak, after contact with certain allergens will appear cough and other symptoms, this time you need to avoid contact with allergens in a timely manner, if necessary, can be given anti-allergy drug treatment, such as cetirizine hydrochloride drops, and so on. The above drugs are recommended to be used under the guidance of a doctor, not to be taken on their own, if the symptoms do not improve, it is recommended to take the baby to the hospital in time to identify the cause of the disease, to give the corresponding treatment.