Children with leg cramps and leg pain, consider leg cold, strenuous exercise, vitamin D deficiency, etc.. 1. Cold legs: children sleep at night legs cold, or daytime sudden cold stimulation, muscle spasms, muscle contraction caused by violent leg pain. 2. Strenuous exercise: If you do not do a good job of warming up before exercise, sudden strenuous exercise, muscle contraction, may also cause cramps and pain. 3. Vitamin D deficiency: will cause calcium and phosphorus metabolism disorders, increased nerve excitability, there will be leg cramps, most of which will also be accompanied by irritability, crying, sweating and so on. If a child has repeated cramps and leg pain, you need to take your child to the hospital to exclude disease factors.