How is it that five-year-old children fall easily when running?

If the child is simply walking posture, it should be easier to correct. I have a nephew who has been like this since he was a child. He feels all thumbs. The hospital examination didn't say it was caused by calcium deficiency. Later, I went to school and failed in physical education. The big man just feels that his movements are not so neat, and there is nothing wrong with others. It was later diagnosed as sensory disorder. Also in the hospital for treatment. It would be nice to be bigger, but I always feel a little uncoordinated. I suggest you visit several different hospitals. Sometimes doctors say very different things. Don't put it off for too long, the bigger the delay, the harder it is to correct it.