The Nurse in a Pediatric Clinic Is Assessing an Infant

The nurse in a pediatric clinic is assessing an infant 2 months of age. The mother states, "He always spits up, but it has become so much worse. Vomit goes everywhere." Which additional assessment will help the nurse identify a possible diagnosis for the infant?

A) A hard mass is palpated in the mid-epigastrium.
B) Vomiting occurs both before and after eating.
C) Weight is normal even with frequent vomiting.
D) Normal skin turgor is noted over the sternum.