Spinal muscular atrophy symptoms

Infantile SMA is the most severe form. Some of the symptoms include:
 * muscle weakness
 * poor muscle tone
 * weak cry
 * limpness or a tendency to flop
 * difficulty sucking or swallowing
 * accumulation of secretions in the lungs or throat
 * legs that tend to be weaker than the arms
 * hypotonia, areflexia, and multiple congenital contractures (arthrogryposis) associated with loss of anterior horn cells
 * feeding difficulties
 * increased susceptibility to respiratory tract infections
 * developmental milestones, such as lifting the head or sitting up, can't be reached.