An occasional dose of acetaminophen (for example, Tylenol®) can be used to lower a slight fever or relieve pain. However, if your child seems particularly unhappy or has a fever of 101.0 F or higher, it is more likely not due to teething. In addition, teething isn't believed to cause diarrhea or sleep problems. If any of these symptoms occur while your infant is teething, consult your child's doctor as it may very well be due to something else.
Hank Bernstein
Children's Hospital