Myotonic muscular dystrophy (MMD) is a form of muscular dystrophy that affects muscles and many other organs in the body.
Unlike some forms of muscular dystrophy, MMD often doesn’t become a problem until adulthood and usually allows people to walk and be pretty independent throughout their lives. The infant form of MMD is more severe. Unfortunately, it can occur in babies born to parents who have the adult form, even if they have very mild cases.