How do i explain muscular dystrophy to a child ?

Varies some: The explanation you use must reflect the developmental stage of the kid. In the tooth fairy era, under age 8, simple & short is best. Illness with weak muscles should suffice, repeated often. The concrete kid 8-teens can handle a little more, but doesn't need much. The idea of a chronic illness with no good treatments.Mid-late teens can handle a deeper discussion about chronic illness.