SMA is a spinal muscular atrophy, which may initially present with symptoms such as pneumonia, weakness in raising the head, weakness in crying, and scoliosis, and requires prompt intervention. Spinal muscular atrophy is an autosomal recessive neuromuscular disease characterized by progressive muscle weakness and muscle atrophy caused by degeneration of motor neurons in the brainstem and spinal cord, and it is a common infantile lethal hereditary neuromuscular disease. Its symptoms are mostly due to muscle weakness. In most cases, the first symptom of spinal muscular atrophy is pneumonia, mostly due to respiratory muscle dysfunction. In addition, type 1 spinal muscular atrophy may be characterized by weakness in lifting the head, weakness in crying, and difficulty in eating. Type 2 spinal muscular atrophy may be characterized by scoliosis and contractures of the joints of the lower limbs. It is recommended to go to the hospital in time to avoid delaying the condition if the above symptoms appear.