Back to Diaper Decoder

Dark Green

Dark Green

AKA: Iron supplementation
Looks Like: Thick, dark stool

If your baby's stool is dark green, it could be the product of iron supplementation in your baby's diet.

What Does It Mean?

In some babies, the bacteria in the intestines react to the iron sulfate in a supplement or in iron-fortified formula. The reaction turns the baby's poop dark green, or sometimes even greenish black. The poop will remain this color as long as your baby is taking the supplement or on the formula. There is no need to be concerned with the color change.

What Should I Do?

Nothing — it's normal. Studies show that iron supplementation doesn't cause digestive problems or discomfort.

Contact your health care professional right away if you see:
  • Blood or mucus in stools
  • Fever
  • Vomiting
  • Irritability
  • Refusal to eat
  • Decreased or dark-colored urine
  • Decreased activity
The information in this section was derived from the following:
Abbott Nutrition. Parents Guide to Infant Stools. March 2009.
McGrail A, Metland D, Murray L, et al. The BabyCenter Essential Guide to Your Baby's First Year. July 2007.
Nathanson LW. The Portable Pediatrician. September 2002.