My son is 2. He had a cold over the holidays. He has mostly recovered from that. He has minimal cough, mostly to clear his throat from drainage. This afternoon, he got a low grade fever. It was around 100.5. I gave him Advil and it came back down and he began behaving "normal." Prior to that he was clingy in our laps, but not fussy and complaining about anything. He still has the cough, but again, mostly to clear his throat. I am get concerned because I have always read it is a time to worry when they get a fever towards the end of a cold - pneumonia, etc. When should I be concerned and take him to be seen? I get overly concerned about the flu, pneumonia, or anything that needs to be treated very early in someone so young.