Three and a half year old children sweating in bed, the following are common: 1, poor indoor ventilation, high ambient temperature, or the child covered by a thicker quilt, then the phenomenon of sweating, you can give open windows and ventilation, the right amount of thickness of the quilt, will be improved. 2, tuberculosis, often after birth is not given on time BCG vaccination, or a history of contact with tuberculosis patients, weekdays weak, at night after sleep will appear If the baby is weak and prone to sweating, he or she can be given oral pediatric astragalus granules, exercise more and strengthen his or her body, and eat more red dates and black sesame.