1. IBD. Presentation of IBD (Crohn disease and ulcerative colitis) is quite variable and depends on the site and severity of inflamed bowel and chronicity of the disease. Most commonly children present with growth failure, diarrhea, abdominal pain, mucous or bloody stools, or weight loss.
2. Milk-protein allergy. Milk-protein allergy is a pathologic immune reaction induced by milk-protein antigens. Up to 50% of children with milk-protein allergy can have a concomitant soy-protein allergy. Usually present with heme-positive or bloody diarrhea and poor growth.
3. Necrotizing enterocolitis. Occurs almost exclusively in premature infants.
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