The principles of treatment for cough in 3-month-old babies are the same as those for respiratory infections in infants. The principles of treatment are: 1. Viral or bacterial infections cause, first of all, anti-infection and anti-inflammatory, if the sputum is sticky you can do nebulization and give drugs to dissolve the sputum. Because the child is small, the key is care, sleep position are to pay attention to, to maintain the side, head slightly high head high position, to avoid reflux or other reasons caused by cough aggravation, or even the possibility of asphyxiation; 2, the infant’s condition changes quickly, the symptoms are not very typical, sometimes have a very serious pneumonia, but also not necessarily cough, mainly manifested as mental depression, breathing becomes fast, this situation should be timely to see a doctor. Because the smaller the baby, the more difficult it is to treat, parents without particularly good medical background knowledge, it is difficult to make good home care and treatment of pneumonia in small babies, it is recommended to see a professional doctor for treatment later.