A 3-month-old baby’s cough can be self-cured if it is caused by inhaling irritating gases. However, if it is a pathogenic infection and the child’s resistance is weak, self-cure is unlikely and active treatment is needed. 1. If the child’s cough is caused by inhaling irritating gases, avoiding exposure to such gases can ease the child’s cough or even make it go away, and this type of cough can usually be cured by the child. 2. If the child is infected with bacteria, viruses and other pathogens, resulting in inflammation of the respiratory tract, viral infections can be self-healing, while bacterial infections are less likely to be self-healing, and require active treatment with amoxicillin and other antimicrobial drugs to be cured. If a 3-month-old child has a cough, and the cough is severe, persistent for a long time and not relieved, it is necessary to go to the hospital in time for examination, to clarify the cause for targeted treatment.