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very concerned about his lack of weight gain

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My 4 year old is underweight for his age (height is ok) he has loose very smelly and very dark stools. Sometimes has has very smelly farts and burps a lot. We are very concerned about his lack of weight gain. We have been giving him an iron and vitamin B tonic, this seems to make his stools better. We have had his stools and blood tested twice for coeliacs, first test was positive second test was negative (12 months between tests) 2 Years ago we took him off wheat and this also improved his stools, but we have just recently had him tested for allergy to wheat and lactose, this also came back negative. Please help us with this as I say we are very concerned that there is something wrong with him that is stopping him from developing correctly.

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replied February 13th, 2011
Digestive and Bowel Disorders Answer A19562
Hello, and thank you for your medical question on e Health Forum.

From the available history, your son's symptoms could be due to malabsorption syndromes, Pancreatic enzyme deficiencies, Pancreatic insufficiency, Intestinal enteropathy, etc.

To know the exact cause, in addition to the tests already been done, you may need barium imaging studies and a mucosal biopsy.

You might need a consultation with a gastroenterologist for additional evaluation.

I hope this helps.

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