A 6-week-old boy is taken to A&E by his mother who says he is vomiting after feeds.

What four further questions would you like to ask about the vomiting to help in making a diagnosis? (4 marks)

You suspect pyloric stenosis, list three other differential diagnoses. (3 marks)

What biochemical derangement fits with the diagnosis of pyloric stenosis? (3 marks)

What would be your initial management at this stage? List three points. (3 marks)

Name the surgical procedure which can correct this diagnosis. (1 mark)