Absolutely, you can have as many specialists as is necessary to treat all your childs ailments. My son (8) has many different diagnosis including PANDAS, sees an Allergist/Immunologist for that, and chronic constipation, sees a Pediatric gastroenterologist for that. He's struggled with the constipation for years, has had many tests to rule out a whole host of disorders (tethered spinal cord/celiac dx/hirshsprungs dx etc), also had the food allergy tests which shows allergic to everything so he still has to eat, tried gluten-free diet, helped a little with behaviour but not constipation. Tried miralax and lactulose for 2yrs now but barium enema shows rectum and sigmoig colon is so severly stretched out he's actually having a cecostomy tube placed next week to do daily antegrade enemas to finally get his colon to shrink back down again to cure the constipation (can take at least a year!). Constipation probably started because of his severe sensory dysfunction causing pain and with-holding which is a vicious cycle. Hope this helps.
