A general body temperature between 37.6°C and 38.5°C with a fever of more than 1 week is called a low-grade fever that does not go away. The duration of a low fever that does not go away in babies varies depending on the cause, mostly due to viral infections, and usually lasts for 3-5 days at most. You need to look for the cause of a low fever that does not go away. Most fevers in babies are caused by viral infections and may last for 3-5 days. Keep your baby as rested and warm as possible at home to avoid catching a cold. Drink more water to take away some of the heat from the body by drinking water. Parents also need to observe the color of their baby’s urine, and should hydrate more when it is yellow in color. If the low fever does not go away for more than 3-5 days and a rash appears, you should promptly visit the pediatrician to improve the blood routine, C-reactive protein and other tests. If the low fever is caused by a bacterial infection, the fever may persist without antibiotics, and it is recommended to improve blood tests such as routine blood tests to clarify the diagnosis. If there is a bacterial infection, antibiotic treatment is needed and the child’s temperature will return to normal only after the infection is controlled. A prolonged low fever will lead to increased consumption of the baby, which may result in poor spirit and appetite, as well as little urine and dry stools, so the baby needs to drink more water and enhance care during the period when the low fever does not subside.