Hi welcome to healthcareMagic
The normal range of heat rate is between 60 to 100 beat per minute.. more than this it is called as tacchycardia... any respiratory infection, will lead to increase in the heart rate
, since your chil is suffering from the cough and respiratory tract
infection and fever
,hence there is tacchycardia. but once the fever and infection is controlled then the HR will come to normal level.. better to consult a pediatrician
...hope I have answered your question..