article_snippet: It causes intellectual disability, seizures, abnormal muscle stiffness, weak muscle tone .
article_snippet: Feeding and swallowing problems are common, and can be complicated by aspiration pneumonia .
article_snippet: Seizures usually begin before six months .
article_snippet: Children with the condition usually die in infancy  from respiratory complications . '
article_snippet: 15 hours of jolting , stiffness, staring, back bending, pale clamminess and at times hypo colour.
article_snippet: There is no cure for the condition and babies rarely live out the condition and babies childhood .
highlights_snippet: There is no cure for the condition and babies rarely live out the condition and babies childhood .