sir / madam my son 4years old.....in this one month every week he had a cold, cough and fever, every week. in the sence 4 times all the symptoms are there what can I do please explain..in one month he loses 1kg body weight

A. There can be a possibility of a viral infection which is why it is repeating every week as you stated so check with your doctor and if needed go for a further testing for confirmation about the reason behind the problem and accordingly they can advise you with the treatment to follow