Prospective Evaluation of Infants With Spinal Muscular Atrophy:

Overview of data to be collected from enrolled infants followed longitudinally and entered into the NBSTRN Longitudinal Pediatric Data Resource 1. Past medical history relevant to pregnancy, delivery, complications in the immediate neonatal period, birth parameters, family history and any medical problems other than SMA (ie prematurity, etc) 2. Ongoing medical history indicating problems related to the following areas: feeding, growth, respiratory status including use of cough assist and bilevel respiratory support, gastrointestinal issues, cardiac symptoms, neurologic symptoms or signs including muscle weakness, hospitalizations, ER visits, other adverse events 3. Assessment of dietary intake and use of nutritional supplements 4. Surgical history and ongoing documentation of assessments and need for g-tube, Nissen, tympanostomy, adenoidectomy/tonsillectomy or other airway surgeries, and orthopedic procedures 5. Caregiver obtained developmental history and documentation of newly acquired and/or loss of previously acquired gross motor skills at the time of each visit 6. Documentation of caregiver reported outcomes 7. Documentation of anthropometric measures, vital signs, general physical examination parameters 8. Neurological examination using standardized tools 9. Time to death, permanent invasive ventilation and/or need for \> 16 hours/day of bilevel respiratory support 10. Specific assessment of motor function as measured using age appropriate motor outcome measures such as: the Children's Hospital of Philadelphia Infant Tests of Neuromuscular Disorders (CHOP-INTEND), Test of Infant Motor Performance Screening Inventory, WHO motor milestones or others, and Hammersmith Functional Motor Scale for SMA Expanded for children 18 months and older 11. Electrophysiologic studies such as maximum ulnar compound muscle action potential (CMAP) amplitude and area 12. Documentation of range of motion, development of limb contractures and/or presence of scoliosis, lordosis, hip dysplasia or other orthopedic outcomes 13. Additional optional exploratory biomarker assessments 14. DEXA measurements to assess body composition and bone density 15. The option to enroll in an autopsy study at the time of death to contribute samples to a research biorepository Normal control subjects such as unaffected siblings will undergo these same measurements, as applicable. Unaffected parents' participation will be limited to collection and banking of blood and cell lines.