The main difference between heavy and light diarrhea in infants and young children is the following: first, the symptoms of infection poisoning are different, heavy diarrhea often has repeated high fever, poor spirit and other symptoms of infection poisoning, while light diarrhea is generally not. Second, the severity of dehydration is different, heavy diarrhea is generally significantly greater than 10 times the number of diarrhea prone to severe dehydration, while sober diarrhea is usually only mild dehydration or dehydration is not obvious. Third, the source of infection is different, heavy diarrhea is mostly bacterial, especially invasive bacterial infection, there are some viruses serious can also appear heavy diarrhea, light diarrhea are mostly non-infectious diseases are more common. Fourth, the treatment is different, heavy diarrhea usually need to stay in the hospital for observation and treatment, light diarrhea generally oral home treatment.