Neonatal fever symptoms are generally manifested through body temperature, mood, appetite, etc., which can be characterized by elevated body temperature, unstable mood, decreased appetite, and so on. 1. Body temperature: elevated body temperature is the most typical symptom, usually the core temperature (anal temperature) over 37.5 ℃ is called fever, which can be manifested as increased heart rate, shortness of breath and so on. 2. Mood: The mood of newborns can be characterized by abnormal crying, irritability, waking up after falling asleep, or depression and poor mental state. 3. Appetite: infants and young children may experience loss of appetite, vomiting, refusal of milk, and a significant decrease in milk intake. Neonatal fever should be treated in a timely manner to avoid the occurrence of febrile convulsions, which affect the central nervous system.