Gastrointestinal bleeding in children.
D002675:Child, Preschool; D005260:Female; D006471:Gastrointestinal Hemorrhage; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases; D008297:Male; D008467:Meckel Diverticulum