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Infants with SMA type I are born with very little muscle tone, weak muscles, and feeding and breathing problems. With SMA type III, symptoms may not appear until the second year of life.
Symptoms in an infant:
Symptoms in a child:
The health care provider will take a careful history and perform a brain/nervous system (neurologic) examination to find out if there is:
Kliegman RM, Behrman RE, Jenson HB, Stanton BF. The hip. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Elsevier; 2007:chap 606.
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