Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of GM1 gangliosidosis ?
    ### Response:
    What are the signs and symptoms of GM1 gangliosidosis? There are three general types of GM1 gangliosidosis, which differ in severity but can have considerable overlap of signs and symptoms. Classic infantile (type 1) GM1 gangliosidosis is the most severe type, with onset shortly after birth (usually within 6 months of age).
    