111SIGNS+AND+SYMPTOMS

Signs and symptoms:

 * muscle weakness
 * abnormal diminished muscle tone
 * enlarged heart, liver, and/or tongue
 * (infant) poor feeding; failure to gain weight, grow, and breathing problems
 * can't hold up head
 * (ages 12-18 months) cardiac failure
 * usually die at age 2

Symptoms may be evident at childhood, adolescence or adulthood (milder at adulthood)