The first feces of a baby is dark green, called meconium. The main component of meconium is water, which accounts for about 72%. It is composed of epithelial cells shed from the fetal intestine, bile, concentrated digestive juice, and swallowed amniotic fluid. It is usually discharged for the first time within 10 hours after birth. Meconium is dark green, a little shiny, odorless, and gradually transitions to normal stool two to three days after eating.