Muscle weakness can begin as early as age 3, first affecting the muscles of the hips, pelvic area, thighs and shoulders, and later the skeletal (voluntary) muscles in the
[mda.org]
Inherited disease that causes progressive weakness in the skeletal (and occasionally heart) muscle.
[seslisozluk.net]
Patients present with muscle weakness in these anatomic areas. The muscle weakness eventually spreads to other skeletal muscles as well.
[icd10data.com]