How can muscular dystrophy affects someone's growth and development?

Depends on which one. Muscular dystrophy is a generic description of several different diseases causing similar symptoms. Some present early in life (as a newborn), others in toddler or early childhood. Some may even present in adulthood (some forms of congenital myotonic dystrophy). Start Here: http://mda.org/

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Can you tell me how muscular dystrophy affects someone's growth and development?

Muscular Dystrophies. are a group of > 30 inherited diseases that cause progressive weakness & deterioration of skeletal muscles that control movement. Some present in childhood; others not till middle age. Some boys with Duchenne MD have mild Intellectual Disability. Involvement of muscles of the heart & GI tract & those used for breathing contribute to morbidity. See http://www.ninds.nih.gov/disorders/md/md.htm. Read more...