My 9 m.o. baby has a fever of 38.3 c. i broke it this morning, but now it's back. he doesn't seem unusually tired or unhappy. when should i see a dr?

Expected pattern: A child with a fever producing illness will run that fever in some pattern until the illness is gone.This would seldom be less than a few days. Acetaminophen is expected to suppress the fever by a degree or so while it is in the system, but it does not "fix" the illness. If the kid fails to drink well enough to void every 6 hours, refuses to play, or other bothersome symptoms, have it evaluated.