Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Isovaleric acidemia ?
    ### Response:
    What are the signs and symptoms of Isovaleric acidemia? Health problems related to isovaleric acidemia range from very mild to life-threatening. In severe cases, the features of isovaleric acidemia become apparent within a few days after birth. The initial symptoms include poor feeding, vomiting, seizures, and lack of energy (lethargy).
    