A parent calls a clinic and reports to a nurse that his 7-day-old infant is hungry more than usual but is projectile vomiting immediately after eating. Fever is not noted. Which of the following responses should the nurse make?

Projectile vomiting in a 7-day-old infant who is hungry more than usual but afebrile is a classic presentation of pyloric stenosis, a surgical emergency caused by hypertrophy of the pyloric muscle that obstructs gastric outflow. The nurse must advise the parent to bring the infant into the clinic immediately so the provider can evaluate for this condition. Pyloric stenosis typically presents between 2 and 8 weeks of age, with forceful, nonbilious, projectile vomiting shortly after every feeding. Infants remain hungry despite vomiting because the obstruction prevents milk from passing into the duodenum. Delay in diagnosis can lead to severe dehydration, metabolic alkalosis, and failure to thrive. The option suggesting more frequent burping addresses normal gas or mild reflux, which does not cause projectile vomiting of this severity. Switching formula is appropriate for milk-protein intolerance, which typically presents with different symptoms such as bloody stools or rash. Oral rehydration solutions are indicated for mild to moderate dehydration from gastroenteritis, not for a structural obstruction that will continue to cause vomiting regardless of what is given. Because this presentation raises serious concern for a potentially life-threatening condition, prompt clinical evaluation — not home management — is the correct response.