Hello dear...I have gone through your post in which you have mentioned about your child passing stools with tiny white specs on them.
Presence of white specs in stool may be due to undigested food (like rice or seeds) or parasite eggs.
So...have a look at his dietary habit & if it still persists, it will be better to get his stool test
I wish you & your son a good health.
Thanks and take care.