Can children with genetic metabolic diseases be cured?

Patient's question:

Diagnosed with a genetic metabolic disease at seven months of age, now five weeks old, unable to walk, can understand but cannot express, unable to control eating, drinking, defecating, and sleeping, sometimes vomiting, and also has congenital heart disease, atrial septal defect, developmental delay

Doctor's answer:

What specific illness is it? Please describe the symptoms and test results in detail.