Type 1: This is the most common and also the most severe type of SMA. It accounts for 60 percent of cases and is generally diagnosed within the first six months of a child’s life. Children with type I SMA will have very limited movement and may be unable to swallow or breathe without assistance.
Type 2: This type is usually diagnosed between six months old and two years old. Children with type 2 will usually be able to sit up unaided but will be unable to walk.
Type 3: Type 3 is less severe although the range of movement diminishes over time.
Type 4: Type 4 is very rare and affects adults. Symptoms usually appear after the age of 35.
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