A mother brings her 3-week-old son to the clinic because he is vomiting "all the time." In performing a physical assessment, the nurse notes that the infant has poor skin turgor, has lost 20% of his birth weight, and has a small palpable oval-shaped mass in his abdomen. Which intervention should the nurse implement first?

The presenting symptoms of the infant, including persistent vomiting, poor skin turgor, significant weight loss, and a palpable abdominal mass, indicate a potential serious condition that requires immediate attention. These findings may suggest dehydration, malnutrition, and the presence of an abdominal mass that could be causing gastrointestinal obstruction or other underlying pathology. Initiating a prescribed IV for parenteral fluid is the priority intervention to address the potential dehydration and fluid imbalance in the infant. This will help restore and maintain adequate hydration while further diagnostic evaluations and interventions are initiated. Feeding the infant, giving 5% dextrose in water orally, or inserting a nasogastric tube for feeding should not be implemented as the first intervention in this case. It is important to stabilize the infant's fluid status before initiating oral feedings or other interventions to address the underlying cause of the symptoms. ​​​​​​​