The common causes of neonatal fever are infectious and non-infectious factors: 1. Infection-induced fever is the most common in clinical practice, because newborns are a special group with a relatively low immune system, so it is easy for infections to occur in the environment, such as common neonatal pneumonia, neonatal sepsis, etc. These can cause neonatal fever. Infectious fever is usually heavy and sometimes progresses relatively quickly, so it is important to go to the hospital in a timely manner to prevent fever from causing infectious shock. 2, non-infectious fever is commonly caused because the environmental temperature is too high, or the package is too hot to cause dehydration in newborns and dehydration fever occurs, and this condition can also cause brain damage in newborns. However, no matter what causes the fever in newborns, the initial identification cannot be made at an early stage, and it is best to go to the hospital promptly.