Hello, my son is 2 years old. In February, he caught cold and cough. Doctor prescribed antibiotics and cough syrup. Then he was relieved. But soon after he has been coughing after waking up or when he starts to cry. Mostly when he wakes up in early morning and starts to dry cough continuously for 15 to 20 minutes. This has been going for past two , three weeks. No problem with x ray. another doctor says he is fine no need to worry. but why he is coughing like that. any idea or suggestions?