Hi welcome to health care magic forum.
It appears that he has swallowed, a nearly 2 C.M, object, and not found in the stools, for 8 days now, in spite of the loose motions.
It is not sure whether it is swallowed, because it is a bit big in size, and already 8 days passed, so i advise you to consult a pediatritian, for having an
X ray, and find the thing, and its where abouts.
If it is found, the plan of treatment may be considered.
I advise you to give him 2 banana a day, to have a soft mass in the intestines, to carry any foreign body out.
Wishing him a quick and comfortable recovery. Thank you.