How to treat: Some parents have "fever phobia" and want to take their kids to the doctor for the slightest increase in temperature. But low-grade fevers (101 degrees or below) typically aren't dangerous. Give baby Infants' Tylenol, undress her, encourage her to drink fluids, and bathe her in tepid water. "Just wiping her down could lower her fever by a degree or two," says Christopher Tolcher, MD, a pediatrician in Agoura Hills, California.