Children’s leg cramps may be caused by a lack of calcium in the body, or may be caused by excessive exercise and other reasons. 1. Calcium deficiency: children during growth and development, the demand for calcium is relatively large, if you do not pay attention to the daily life of calcium supplements and do not pay attention to supplementation, it is easy to leg cramps, calcium deficiency. This kind of children may also be accompanied by short stature and yellowish clinical symptoms, it is recommended to supplement nutrition as soon as possible. 2. Excessive exercise: Excessive physical exercise may lead to muscle spasms, which are also prone to cramps, so it is recommended that children should warm up sufficiently before exercising. There are many causes of leg cramps in children, it is recommended to take the child to the hospital in time to avoid delaying the condition.