Question: what is type 1 sma?
Answer: The types of spinal muscular atrophy (SMA) are: Type 1 (severe) SMA: This type is also called Werdnig-Hoffmann Disease. It is the most severe and the most common type of SMA. It is usually evident at birth, or in the first few months afterwards (0-6 months). Symptoms include floppy limbs and weak trunk movement.