Problem: A three-week-old infant presents to the clinic with sudden onset of abdominal distention and bilious vomiting. What will the primary care nurse practitioner do? Need Assignment Help? Question options: A) Order a plain abdominal radiograph and refer the infant to a pediatric surgeon. B) Change the infant's formula from cow's milk based to extensively hydrolyzed formula. C) Encourage smaller and more frequent feedings D) Advise the parents to monitor for fever over the next 24 hours.