1. Symptoms of diarrhea in four-month-old infants 1.1 Manifestations of diarrhea Among four-month-old infants, diarrhea is one of the common diseases. The main manifestations of diarrhea include increased stool frequency, increased stool volume, watery or yellow watery stools, and even mucus and blood streaks. In addition, symptoms such as bloating and loss of appetite may occur. 1.2 Vomiting and fever In addition to the above symptoms, diarrhea in four-month-old infants may also be accompanied by vomiting and fever. Vomiting possible