I have a 4 year old grandchild who has recently developed a significant limp in his right leg. He does not appear to be in pain except when you try to straighten out his knee. He had a similiar episode approximately 2 years ago which progressed to the point he had difficulty walking however he did not appear to be in pain. This episode lasted approximately 2-3 days. His current problem has been ongoing for 2 weeks. The way he holds his arm when he walks reminds me of a child with a brain injury. I am concerned there may be some neurological problem causing his intermittent symptoms.