Fever is a symptom in itself, and when a two-year-old baby has a fever, it can cause a variety of other symptoms, such as causing nausea, vomiting, loss of appetite, drowsiness, cold limbs, mental lethargy and other symptoms, which may also be accompanied by the appearance of other symptoms, such as nasal congestion, running nose, convulsions and even coma. Therefore, the specific symptoms of fever in two-year-old babies are closely related to the causes and diseases that cause fever. When a two-year-old baby has a fever, it is important to make a clear diagnosis and identify the cause in time. If it is a general upper respiratory tract infection, mostly caused by viral infections, only need to give antipyretic, symptomatic treatment can be given, that is, when the body temperature is more than 38.5 ℃, acetaminophen or ibuprofen can be given to reduce fever. However, if the fever is caused by pneumonia or intestinal infection, antibiotic treatment is needed, such as cefuroxime, cefadroxil and other drugs. If it is a mycoplasma infection, it needs to be treated with drugs such as azithromycin and roxithromycin, and at the same time, rehydration therapy should be actively given, including drinking more warm water and more milk.