In most cases, frequent sweating in children is caused by calcium deficiency, which can occur in children who are growing very fast and whose parents do not pay attention to calcium supplementation. Calcium deficiency in children not only causes more sweating, but also causes softening of the bones, resulting in the occurrence of X-leg and O-leg, and can sometimes cause growing pains in children. For children with calcium deficiency, they need to take calcium supplements such as calcium carbonate granules or calcium gluconate oral liquid in time. Parents can give children milk every day to prevent calcium deficiency because of its high calcium content and better absorption.