98.6 is technically average, but after seven years of nursing, my average opinion is everyone is about 97ish. A temperature in an infant is a medical emergency. Call your doctor right away.
A fever of less than 101 is of no interest to me unless you have pain in your right lower abdomen. (Possible appendicitis). I will gladly medicate you if you ask.
I treat fevers greater than 101 for comfort or if you ask me to. And I always treat a fever over 103. If a temperature in the person reaches 104, they have a much higher risk of having seizures.
It is very important to stay hydrated when you have a fever. You burn off a lot of fluid through breathing and sweating and just being hot in general. So drink fluids. Water works great. So do the fancy drinks like Gatorade. I like the grape flavor.
Personally, when I get a fever, I like to sit around and whine and complain and refuse to take medicine. Nurses are the worst patients.