Cramps in children are mainly due to two reasons: calcium deficiency and excessive daytime activity, which can cause cramps. When cramps occur, massage can be performed on the cramped area to relieve the muscle spasm and thus relieve the cramp symptoms. After the recovery of cramps, you can apply heat to the cramped area to promote the absorption and decreasing of edema after cramps. You can eat foods high in calcium, such as shrimp, soy products, dairy products, lean meat and other foods. You can also take oral calcium tablets and vitamin D to promote calcium replenishment and thus prevent the symptoms of leg cramps in the later stages.