My son is almost 4 years old and began daycare about 7 months ago. He has been sick for most of the 7 months. Now, this past month, he has been fevering on and off for the whole month. He got penicilin for an ear infection two weeks ago, and is still having fevers on and off. Is it normal for a 4 year old to have a fever on and off, with runny nose and cough, for a whole month?