Level 1: Causes and symptoms of diarrhea 1. Causes of diarrhea Diarrhea is caused by infection or abnormal digestive function caused by bacteria, viruses, parasites, etc. in the intestine. Common pathogens include Escherichia coli, Salmonella, Vibrio cholerae, etc. 2. Symptoms of diarrhea Diarrhea is mainly characterized by increased stool frequency, decreased stool volume, soft or watery texture, and is often accompanied by uncomfortable feelings such as abdominal distension, abdominal pain, nausea and vomiting. Level 2: Baby’s dietary precautions 1. Avoid