Yellow poop or yellow diarrhea can have many causes, and though it's often harmless, it can indicate a more serious health ...

The poop of newborns is almost black, while older infants tend to have yellow or brown poop. Breast milk and formula can also influence the color of a baby’s stools. Red or white poop can ...

The color should be yellow. Contact your pediatrician if ... Jennifer Shu, MD, FAAP, Pediatrician The first few stools of a baby's life will be blackish-green and sticky , It's called meconium.

Once the baby is a few days older, their poop will become soft and yellow. It may differ depending on whether they drink breastmilk or formula, though. Some infant formulas can make the poop green.