Case Scenario 1: 7-month-old boy with recurrent vomiting
Summary of the history
7-month-old boy with recurrent blood-stained vomiting and recurrent infection.
Physical examination
Alert, pink, no finger clubbing
Abdomen: soft, liver 2 cm below costal margin, no mass palpable
Cardiovascular system: first and second heart sound heard with no murmur
Lung: good and equal breath sound bilaterally
Anthropometric measurement
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Answer the following questions with regard to the case scenario above.

