Once a newborn baby has a fever, it mostly means that the condition is more serious. If the temperature reaches 39℃, it means that the condition is more serious, because newborns are a special period with weak resistance, and fever often means infection, which can easily cause sepsis and even septic meningitis. Some newborn fever is related to the environment, such as wrapping the child too thickly, resulting in a lot of sweating and dehydration, causing dehydration fever, even if it is not caused by infection, but dehydration caused by fever can easily cause brain damage. Therefore, a fever of 39℃ in newborns represents a more serious condition, and it is necessary to go to the hospital in time to exclude infection in newborns and treat them actively.