Is Dark Green Stool Normal for My 2-Month-Old Premature Baby? - Pediatrics

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Infant stool


Hello Doctor: My baby is just over two months old, and recently the stool color has appeared dark green.
Is this normal? The baby was born 40 days early and is a premature infant.
Please advise, thank you!

A-Hong, 30~39 year old female. Ask Date: 2009/04/17

Dr. Zhang Yingwen reply Pediatrics


The dark green color of the stool is often due to the iron content in formula milk.
If there are no traces of blood, abdominal pain, vomiting, or excessive crying, it is generally not a cause for concern.
If you still have questions, feel free to consult in the clinic, and we wish your baby a healthy and happy growth.

Reply Date: 2009/04/17

More Info


Dark green stool in a 2-month-old premature baby can indeed be a source of concern for parents, but it is often a normal occurrence, especially in infants who are fed formula. The color of a baby's stool can vary significantly based on several factors, including diet, digestion, and the presence of bile.
In the case of your premature baby, who was born 40 days early, the dark green stool may be attributed to several reasons. One common cause is the presence of unabsorbed iron from formula milk. Many infant formulas are fortified with iron to prevent iron deficiency anemia, which is particularly important for premature infants who may have lower iron stores at birth. When the body does not fully absorb this iron, it can lead to a greenish stool color due to the presence of bilirubin and other bile pigments.

Additionally, the first stools that a newborn passes, known as meconium, are typically dark green or black and are composed of materials ingested in utero. As the baby begins to digest milk (whether breast milk or formula), the stool color can change. Green stools can also occur if the baby is experiencing rapid transit through the intestines, which can happen if they are not fully digesting the nutrients in their formula.

It is also important to consider the overall health of your baby. If your baby is feeding well, gaining weight appropriately, and does not exhibit any signs of distress (such as excessive crying, vomiting, or abdominal pain), then the dark green stool is likely not a cause for concern. However, if you notice any additional symptoms or if the stool color changes to a more concerning shade (such as red or black, which could indicate blood), it is crucial to consult your pediatrician.

Regarding the frequency of bowel movements, it is normal for infants to have varying patterns. Some babies may have several bowel movements a day, while others may go a few days without one. As long as your baby is comfortable and not showing signs of constipation (such as hard stools or straining), infrequent bowel movements can be typical.

In summary, dark green stool in your 2-month-old premature baby is generally considered normal, especially if they are on formula. It is essential to monitor their overall health and consult with your pediatrician if you have any concerns or if there are changes in their stool or behavior. Regular check-ups will help ensure that your baby is developing healthily and that any potential issues are addressed promptly.

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