Dark Stool in Toddlers: When to Worry - Pediatrics

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Black stool in infants?


Hello Dr.
Hsiao: My daughter is 3 years and 2 months old.
She stopped drinking milk at two and a half years old and has been eating the same food as adults.
In the past two months, I have noticed that her stool color is very dark, almost black, and sometimes has a deep greenish tint.
She usually has a bowel movement once a day, occasionally twice a day.
She eats fruit every day and drinks about 500-1000 cc of water, sometimes less than 500 cc.
Her stool is darker and blacker than that of adults.
Is it normal for such a young child to have such dark stools? Thank you, doctor, for taking the time to read and respond.

shiny, 30~39 year old female. Ask Date: 2015/07/21

Dr. Xiao Kaiwen reply Pediatrics


If the stool color is as dark as hair, it is important to be cautious of potential upper gastrointestinal bleeding.
It is recommended to go to a major hospital for a simple fecal occult blood test to determine the situation.

Reply Date: 2015/07/21

More Info


When it comes to understanding dark stool in toddlers, it's essential to consider several factors that could contribute to this change in color. Dark or black stools can be concerning for parents, as they may indicate various underlying issues. However, it's important to remember that not all changes in stool color are indicative of a serious problem.

In your case, your daughter is three years and two months old and has recently transitioned to a diet similar to that of adults. The fact that her stool is very dark, bordering on black, and sometimes has a deep green hue, warrants attention. There are several potential causes for dark stools in toddlers:
1. Dietary Factors: Certain foods can cause stool to appear darker. For instance, foods rich in iron, such as spinach, black beans, or iron-fortified cereals, can lead to darker stools. Additionally, foods with dark pigments, like blueberries or black licorice, can also affect stool color.

2. Supplementation: If your daughter is taking any iron supplements or multivitamins that contain iron, this could be a significant factor in the dark coloration of her stool.

3. Digestive Health: Dark stools can sometimes indicate bleeding in the upper gastrointestinal tract, which can lead to the presence of digested blood in the stool. This is a more serious concern and would require immediate medical attention.

4. Bile Production: The color of stool is also influenced by bile, which is produced by the liver. If there is a disruption in bile production or flow, it can affect stool color. However, this is less common in toddlers.

5. Hydration: You mentioned that your daughter drinks between 500cc to 1000cc of water daily. Adequate hydration is crucial for healthy digestion and stool consistency. If she is not drinking enough fluids, it could lead to harder stools, which may appear darker.

Given these factors, it is advisable to monitor her stool closely over the next few days. If the dark color persists, or if you notice any additional symptoms such as abdominal pain, vomiting, changes in appetite, or if the stool appears tarry or has a foul odor, you should consult a pediatrician promptly. These could be signs of a more serious condition that requires medical evaluation.

In conclusion, while dark stools in toddlers can be caused by dietary factors or supplements, they can also indicate underlying health issues. It's essential to keep an eye on her overall health and any accompanying symptoms. If you have any concerns, do not hesitate to reach out to your child's healthcare provider for further assessment and guidance. They can provide a thorough evaluation and determine if any tests or interventions are necessary to ensure your daughter's health and well-being.

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