7-year-old children sweat a lot mainly for some of the following reasons: a. Children are more active and have a faster metabolic rate, especially in the summer when the weather is hotter will show more sweating. Second, due to the lack of vitamin D resulting in poor absorption of calcium, there will be a deficiency of calcium in trace elements, will be due to a lack of calcium and sweating. It is recommended to have more sunlight exposure in daily life to help the skin synthesize vitamin D. It is also good to take oral calcium or Longmu Strong Bone Punch. The children of 7 years old with weak constitution and poor immunity will also show excessive sweating, they can take oral Yu Ping Feng granules, transfer factor, spleen amin peptide lyophilized powder, etc. to improve the immunity of children, and at the same time, they should strengthen physical exercise in their daily life, which will help improve the immunity of children.