Baby sweat can be seen in normal physiological phenomena and pathological conditions (such as fever-causing diseases, vitamin D deficiency), the specific need to analyze and judge according to the baby’s specific situation. 1. Physiological phenomenon: the baby metabolism is vigorous, there can be sweaty performance, or the baby is located in the environment of higher temperatures and wear thicker clothing, there can also be sweaty phenomenon, usually if the baby has no obvious abnormal symptoms, are normal physiological phenomena. 2. Pathological conditions (1) febrile diseases: such as respiratory infections, babies can appear feverish symptoms, while the phenomenon of excessive sweating to increase heat dissipation so that the body temperature gradually decline. In this case, it is recommended to consult a doctor for active treatment. (2) Vitamin D deficiency: such as nutritional vitamin D deficiency rickets, commonly found in younger babies, can occur in the phenomenon of increased neural excitability and sweating, and some of them can appear in the softening of the skull, square skull and other skeletal changes. (3) other: such as tuberculosis, the baby may have a history of exposure to tuberculosis, may be manifested as night sweats, low-grade fever, chest X-ray and tuberculin test and other tests can assist in the diagnosis. The baby sweats a lot, if exclude the physiological phenomenon, should consult the doctor in time, by the specialist assessment judgment, clear cause and give targeted treatment.