Leg cramps in children are caused by calcium deficiency in the body. When the body lacks trace elements of calcium, local muscles will spasm and even convulsions will occur, which will lead to leg cramps and should be treated with calcium supplementation in a timely manner. You can start with oral calcium gluconate oral solution or calcium lactate oral solution. You can also consider the use of dietary therapy as appropriate, you can eat more calcium-rich foods, such as shrimp, dairy products, soy products and a variety of other nutty foods, are rich in calcium, you can eat more, can effectively replenish the body’s calcium. It is also important to pay attention to more sunshine, keep more than two hours of sunshine every day, which is conducive to the synthesis of vitamin D and accelerate the absorption of calcium, which can well relieve the leg cramps caused by calcium deficiency. The legs should not be subjected to the stimulation of cold air, which is likely to induce the aggravation of leg cramps after the legs get cold.