An infant born 2 days ago has not passed a meconium stool and begins to vomit bilious secretions. Which action should the nurse take first?

Choice A rationale Gathering supplies for an IV infusion is essential in many cases but not the priority here. Measuring abdominal circumference helps determine if there is abdominal distention indicating a possible blockage, which could suggest a condition like Hirschsprung's disease. Early detection and appropriate intervention are critical, making it the first action. Choice B rationale Preparing for anorectal surgery may be necessary if a diagnosis like Hirschsprung’s disease or imperforate anus is confirmed. However, the initial priority is to assess for signs of abdominal distention by measuring the circumference, providing crucial information for the next steps. Choice D rationale Monitoring strict urinary output is important for overall fluid balance and identifying complications related to fluid shifts. However, in this scenario, the priority action is to assess for abdominal distention, a potential sign of a serious underlying condition causing the symptoms observed in the infant.