Here are the colors poop can be whats normal and what you should see a doctor.
Tarry black poop, your baby's first poop, is called meconium. You'll never see it again once it passes.
Mustard poop is common for breastfed babies. Supposedly breastfed babies make sweeter smelling poop.
Green poop is normal in the realm of baby poop.
Orange poop is also par for the course.
Yellow poop Yellow is normal.
Multiple color and color-changing poop - as long as the colors are listed above (sans meconium reference), there's nothing to worry about. Baby poop changes colors on a frighteningly regular basis.
Chalky white poop could indicate that there is no bile from the liver to digest food. Call the doc.
Tarry black poop, when NOT the first poop, could mean there is blood in the digestive tract. Call the doc.
Bright red blood in poop means blood has been expressed very close to the anus (i.e. no time to turn black.) Call the doc
at 10:20 PM on Dec. 3, 2010