Can blueberry pomegranate juice cause black stools in toddlers?

Blueberry and pomegranate can cause black or dark purple stool in both adults and children. This generally is not harmful and is simply due to the deep pigment levels in the berries and juices. As long as the stool is soft and of normal consistency, there is no need for concern. However, if the stools are hard, dry, or if there are other concerning symptoms, it's always a good idea to consult with a healthcare professional to rule out any underlying medical issues.