For children who sweat a lot at night in bed, medically called night sweats, the common causes are as follows: 1. In the case of infants and young children, this is mainly seen in cases of vitamin D deficiency and calcium deficiency. 2. It is also seen in children with weak spleen and stomach functions and malnutrition, who are prone to night sweats. 3. If the child has symptoms of tuberculosis infection and poisoning, such as low fever in the afternoon and frequent coughing, and conventional treatment is not effective, it is also important to focus attention to whether there is a factor of tuberculosis infection, because tuberculosis infection is a more common cause of night sweats.4. There are also some children who have underlying diseases themselves, such as poor nutrition, chronic infectious diseases, inflammatory bowel disease, etc. In these cases, the baby is weak and also prone to sweating at bedtime.