my son is 4 yr old. recently joined for pre school 2 months ago. from that time till now he is suffering from cold and cough and fever comes suddenly and vanishes ltr... got check up from doc many times he was told cough is due some allergies... as per doc prescribed we give him medicines on time by the time medicines ends his cough will get stopped he will be fine for 2 to 3 days... and again later same problem continues starts from high fever later continues with cough.... pls suggest me whether we should do any tests on him .. or does any others kids has a same problem. he is pre mature child