Usually newborn diarrhea stools are yellowish, yellowish-green. 1. newborn baby stool is watery, yellowish, mostly considered for the newborn baby abdominal diarrhea diarrhea caused by E. coli infection. 2. Newborns stool yellowish green, usually staphylococcal infection; 3. Newborns stool was yellowish green dilute watery or tofu dregs, foamy, mostly considered for fungal infection caused by newborns diarrhea. 4. After a newborn is born, the color of stool is usually dark green, which is related to the swallowed amniotic fluid, epithelial cell shedding and also intestinal secretions. It takes 2-3 days, with the drinking of breast milk or after eating formula, the color of the stool will gradually become lighter, turning into yellow-green stool. If your newborn’s diarrhea is severe or does not improve, it is advisable to go to the hospital.