The color of newborn baby’s stool at birth is mostly dark green, which can gradually transition to golden yellow pasty stool 2 to 4 days after birth. Most normal newborns can pass fetal stool within 12 hours after birth. Fetal stools of newborns are mixed with intestinal wall cells, fetal fat, fetal membranes and bile mucus, etc. Therefore, the color of the baby’s stools can be dark green or black, which is a normal phenomenon. Generally after 2~4 days of birth, the newborn’s stool is usually from dark green transition to golden yellow paste-like stool. Since the gastrointestinal function of newborns is not yet well developed and the activity of digestive enzymes is insufficient, the nature, color and frequency of stools may vary depending on the feeding method. Generally speaking, breastfeeding stools are mostly golden yellow paste-like stools, and more often, while formula milk stools are light yellow formed stools, relatively less often, are normal. However, if blood, foam, mucus or pus appears in the stools of newborn babies, and the babies show signs of crying and loss of appetite, the possibility of disease should be considered. You need to take your baby to the hospital in time to find out the cause of the disease and give targeted treatment if necessary.