Thanks for your query.
Read and understood the problems your son is going through.
Unable to pass stool without Miralax since he was 4 months old and now he is 20 months old. You have visited 5 Doctors but no answers.
The probable causes are:
Segment of intestine not having proper nerve supply.
Congenital obstructing lesion.
The causes can be found out by visiting Pediatric Surgeon (specialized in Gastroenterology preferably- if you can get).
Contrast intestinal studies colonoscopy, biopsy and such investigations can get the proper answer.
You have to manage in this way to find a diagnosis and then only proper treatment can be instituted.
Hope this helps.
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