1. What is baby diarrhea? Diarrhea in babies means that the baby\’s stool becomes thin, even watery or yellow, and the frequency increases. This condition is usually accompanied by symptoms such as diarrhea, abdominal pain, and loss of appetite. 2. Why do babies have diarrhea? 1. Infection: Since their immunity is not yet fully developed, infants and young children are susceptible to infections by various bacteria and viruses, such as E. coli, salmonella, etc. 2. Dietary problems: Overfeeding or adding complementary foods too early, as well as dietary problems such as dairy allergies