Most of the symptoms of infant diarrhea are changes in the number of bowel movements, changes in the nature of feces, and abdominal pain. 1. Changes in the number of bowel movements: the number of bowel movements is higher than before. If the baby has acute diarrhea, the number of bowel movements can be several times or even dozens of times a day. 2. Changes in the nature of feces: the feces of infants are thin or watery, with a small amount of mucus in the feces, and a small amount of pus and blood in a few infants. 3. Abdominal pain: if the infant is acute diarrhea, mostly accompanied by abdominal pain, especially infectious diarrhea is more obvious. If the infant is small bowel disease caused by diarrhea, the pain is often around the navel, and the pain will not be significantly relieved after defecation. If the infant diarrhea is caused by colon lesions, the pain is mostly in the lower abdomen, and the pain will be relieved after defecation. In addition, infant diarrhea can be accompanied by vomiting, alternating diarrhea and constipation, dehydration and other symptoms. It is recommended to seek medical attention when an infant develops an abnormal condition to avoid delays.