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The most common form of glycine encephalopathy, called the classical type, appears shortly after birth. Affected infants experience a progressive lack of energy (lethargy), feeding difficulties, weak muscle tone (hypotonia), abnormal jerking movements, and life-threatening problems with breathing.
Symptoms of vitamin B12 deficiency may include fatigue, weakness, shortness of breath, loss of appetite, constipation or diarrhea, mouth or tongue soreness, balance problems, confusion, anemia (not having enough red blood cells) and possibly nerve damage that causes numbness or tingling in the hands and feet.ymptoms of vitamin B12 deficiency may include fatigue, weakness, shortness of breath, loss of appetite, constipation or diarrhea, mouth or tongue soreness, balance problems, confusion, anemia (not having enough red blood cells) and possibly nerve damage that causes numbness or tingling in the hands and feet.