Three months baby a little slight cough, can consider physiological reflexes, external environmental stimuli, disease factors, according to the cause of the need for treatment. 1. physiological reflexes: three-month-old babies in the milk, due to eat too quickly, not completely swallowed will be, the throat caused by stimulation, easy to appear slight coughing, occasionally such a situation, can not be treated. 2. External environmental stimuli: a long time in a relatively dry environment, will lead to the phenomenon of baby dry cough, there will be a slight cough performance, it is recommended that appropriate to the child to drink water, moisturize the throat. 3. Disease factors: common respiratory tract infections can lead to a child with a mild cough, if caused by viruses, generally can be self-healing, without special medication. If the combination of bacterial infection, should follow the doctor’s instructions to use cefixime, amoxicillin and other antibacterial drugs. There are more reasons for a three-month-old baby to have a slight cough. In addition to coughing, if there are other symptoms, it is recommended that you take your child to a specialized children’s hospital for consultation. All of the above medications should be used under the guidance of a doctor, avoid self-medication.