Propionic acidemia is a rare inherited disease characterized by inability of the body to process certain proteins and lipids. Consequently, there is a build up of organic acids. These signs and symptoms of propionic acidemia arise few days after birth. These includes poor feeding, vomiting, loss of appetite, lethargy, hypotonia, seizures, and coma. In severe cases, it may be fatal. Reference: https://medlineplus.gov/genetics/condition/propionic-acidemia/ Image via: https://www.drgreene.com/qa-articles/propionic-acidemia