For most fractures it is recommended that kids start to do some movement of the arm after the first few days. Basically, the child will decide how much activity is too much by how he or she feels. You should not feel that you have to stop him from doing all activities. Kicking the ball around is fine; you do want to limit activities that require large movements of the arm (eg swimming) for a week or two. It also makes sense to limit activities where there is a great chance of falling onto his outstretched arms ( soccer, football and hockey games), as a fall like that could disrupt the healing fracture and cause more pain. Kids heal pretty quickly though, and after 2 or 3 few weeks, he should be able to do most activities.
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