Baby has been low fever during the day and normal at night, it may be normal or caused by infection and other diseases, attention should be paid to detect changes in the baby’s body temperature, promptly consult a professional doctor and deal with it accordingly. Common causes 1, physiological fever: according to the circadian rhythm of body temperature changes, the baby generally high body temperature during the day, low body temperature at night, low fever is caused by the baby’s high metabolism, baby teeth eruption period, can also be accompanied by fever symptoms; 2, the external environment: caused by too much clothing or high ambient temperature, resulting in low fever during the day, the night temperature is lower, the baby clothing is also less, the body heat dissipation body temperature back to normal. Belongs to the normal situation; 3, infection: bacteria, viruses and other microorganisms invade the body, resulting in respiratory tract infections, gastrointestinal tract infections, etc., fever symptoms, may be more obvious during the day than at night; 4, other diseases: such as hyperthyroidism, resulting in endocrine and metabolic dysfunction, causing fever, sweating and other abnormalities, more obvious during the day than at night. Treatment 1, physical cooling: cold towels can be used to wet compress, or use warm water to wipe the body for physical cooling; 2, medication: it is recommended to use medication under the guidance of a doctor, such as taking pediatric antipyretic granules; the presence of bacterial infection, you can follow medical advice to use antibiotics. Note daily attention to keep the baby warm, timely increase and decrease clothing, timely drying after bathing or sweating, such as repeated fever, difficult to relieve, it is recommended to go to the hospital in a timely manner.