my son is 22 months and has had foul smelling stool for a few months now. they have always been soft - i don t think he has ever had hard stool yet. the color has been consistently been a orange/light brown , the smell is enough to make me gage , smells like rotten egg.
Hi! Soft and foul smelling stools can be a sign of fat malabsorption.  Since it is a recent onset it is most likely some infectious cause. Make sure your child is deformed. Also get stool test for fat globules