My 4-month-old daughter keeps coughing repeatedly. She doesn't seem to be in pain, but this cough seems to bother her. What should I do?

If your 4-month-old daughter is coughing repeatedly and it seems to be bothering her, you should try using 3mL of saline water per nostril with a syringe without a needle 3 to 5 times a day. If the cough persists after 7 days or if she develops a fever, it would be best to consult a doctor.