Flaccid fever is a more common type of clinical fever, also known as septic fever and wasting fever, which refers to a body temperature that is often above 39°C, fluctuates widely, with a range of more than 2°C in 24 hours, and remains above normal at its lowest temperature. It is commonly seen in sepsis, septic inflammation, severe tuberculosis, Kawasaki disease, advanced tumors, malignant histiocytosis, etc. As the body temperature is too high, the body consumption is relatively large, and even damage to the central nervous system and various systems can be caused, and should be promptly treated by cooling down the temperature. It is commonly seen in sepsis, sepsis, severe tuberculosis, infective endocarditis, rheumatic fever, Kawasaki teratology, advanced tumors, malignant histiocytosis, etc. Flaccid fever is also known as septic fever. It follows that flaccid fever in newborns may be caused by having sepsis, so in order to avoid the symptoms of flaccid fever in newborns, we need to understand what causes sepsis in newborns. Causes of sepsis in newborns: The skin and mucous membranes of newborns are thin and tender, easily broken, and the unhealed umbilicus is the portal for bacterial invasion; more importantly, the immune function of newborns is low, and the infection is not limited when bacteria enter the bloodstream from the skin and mucous membranes. Since the immune system of newborns is immature and immune function is poor, they are very prone to infections, which are difficult to confine and lead to extensive inflammatory reactions throughout the body after infection occurs, and the disease progresses faster. The common pathogens are bacteria, but other pathogens such as mycobacteria, viruses or protozoa can also be present.