SMA Type 3, or Spinal Muscular Atrophy Type 3, is a genetic disorder that primarily affects muscle strength and movement. It is caused by a deficiency of the SMN1 gene, which is essential for the survival of motor neurons. Individuals with this type typically experience muscle weakness and difficulty with mobility, but they often have a longer lifespan compared to other types of SMA. Symptoms usually appear between the ages of 18 months and 3 years, and affected individuals may be able to walk independently for some time. However, they may eventually require assistance or mobility aids as the condition progresses. Early diagnosis and intervention can help improve quality of life for those with SMA Type 3.