Baby is 9 weeks old and this is her recent diaper poop. Colour is very dark and runny. Is this diarrhea?

It looks like a good diaper. Is baby formula fed or Breastmilk fed? Usually babies who are breastmilk fed, their diaper output will be runny due to no solid intake. As long their poo is not in pale white color, its ok. For young babies, diaheera is only counted when they have more then 6 soiled diapers a day.

Looks like diarrhea. How many times as she passed motion like this?