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You are seeing a 2yo patient with 6 hours of intermittent episodes of apparent abdominal pain happening every 15-20 minutes, and non-bloody non-bilious vomiting. In between episodes, the child appears well and is playful. There is no fever, diarrhea, or concern for toxic ingestion. The child has a history of constipation with hard stools and occasional skipped days with no stooling. There is no other significant past medical history.