According to Seattle Children’s Hospital, a doctor should be consulted immediately if a child's temperature exceeds 103 degrees Fahrenheit and is not reduced within two hours of taking fever medication. In addition, parents should note other symptoms that occur.
Seattle Children's also recommends checking with a doctor if a 2-year-old has a rectal, ear or temporal artery temperature above 100.4 degrees or an armpit temperature of 99 degrees and if the fever lasts for 24 hours. WebMD points out that fevers are often beneficial, because they are an indication that the body's immune system is at work. Fevers alone do not indicate the degree of illness. A child with a simple cold sometimes has a fever of 104 degrees, but a serious infection occasionally shows no fever.