Hello and welcome to e health forum.
Since a ultrasound of the abdomen has been found to be normal, it is most probable that your son is indeed having constipation, associated with reduced intestinal motility.
Constipation is very common in children and it is usually caused by not drinking enough fluids, ânot eating enough fiber, or having a diet high in constipating foods (milk, cheese, banannas, etc.).â
Children with constipation usually either have very large hard stools or hard pellet like stools. âBowel movements are also infrequent and painful.â
Treatments for childhood constipation usually includes stool softeners and changing the child to âa less constipating diet, with more fiber and fluids. â
Good choices of fluids include apple and prune juice and perhaps switching older children to soy âmilk. Reading food labels can help you to find high fiber foods.â
I hope this helps.
I hope this helps.