Spot Dx — What’s making this infant fuss?

Lachie, a three-week-old boy, is brought in by his parents with abdominal distension and blood in the faeces for the past 12 hours.

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Lachie, a three-week-old boy, is brought in by his parents with abdominal distension and blood in the faeces for the past 12 hours.

He has been unusually fussy with feeds for the past two days. He was delivered vaginally after spontaneous onset of labour at 34 weeks’ gestation.