My son who is 3 has suffered with constipation for about 9 months now, what is the best natural treatment you can suggest?

Prune juice: Prune juice or prunes worked well when needed for my children.

Meds and evaluation: Stool softeners and/or miralax, (polyethylene glycol) but evaluation is important to rule out metabolic issues, pelvic floor problems, hirschprung's disease, or GI stenosis, particularly if constipation persists. Best to him please.

Chronic constipation: Needs to be assessed by a pediatrician or pediatric gastroenterologist, with a plain x-ray of his abdomen. If he's not "cleaned out" before giving bulk laxatives/prune juice, he'll cramp worse. Stool softeners must be given for 6 months or > after clean-out to prevent stool with-holding, encopresis, & long-term health problems. Reduce intake of milk & milk products to 16-21 ounces/day.