A 12-month-old boy presents to the ED with abdominal pain. You suspect intussusception.

1. List three predisposing factors in this age group. 3 marks

2. State four key aspects to assess in the history. 4 marks

3. State three clinical findings you would seek on examination. 3 marks

4. List two ultrasound findings suggestive of intussusception. 2 marks