Medically reviewed by Jay N. Yepuri, MD Yellow poop can be a sign you have excess fat in your stool. This may be because you've eaten a lot of fatty foods. You could also have a medical condition that ...

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.