The baby is fine during the day to the night on the fever may be due to too much wrapping and other physiological factors, this time without special treatment; may also be due to acute upper respiratory tract infection, leukemia caused by pathological factors, this time need to be treated through general treatment, drug therapy and other methods of treatment. 1. Physiological factors: children’s body temperature center is not well developed, body temperature can be too tight night blanket, crying, eating night milk and other factors make the body temperature slightly as high as 37.5 ℃ or so, such as just an individual once the body temperature reaches 37.4 ℃, the body is in good condition, there is no self-awareness of the symptoms, is not a pathological state. Generally, no special treatment is needed, and it is only necessary to increase heat dissipation by reducing the number of clothes and blankets. 2. Acute upper respiratory tract infection: the above fever symptoms can occur, may be accompanied by nasal congestion, runny nose and other symptoms, daily attention should be paid to drink more water, maintain a certain degree of indoor temperature and humidity, maintain indoor air circulation. If there is bacterial infection, oral cefaclor anti-infection treatment should be taken, and at the same time, body temperature over 38.5℃ should be used ibuprofen or acetaminophen for symptomatic antipyretic. 3. Acute leukemia, the disease can appear during the day nothing at night on the fever, often repeated temperature for a longer period of time, the heat type is not certain, improve the bone marrow aspiration and other tests can assist in the diagnosis, the diagnosis is clear the need to use chemotherapeutic drugs, such as vincristine, Zoerythromycin, etc. for treatment. There are many other causes of the above symptoms in babies, it is recommended to consult a specialist for evaluation and treatment, and the above drugs should be used under the guidance of a physician.