The nurse is caring for a neonate at 38 weeks' gestation when the nurse observes marked peristaltic waves on the neonate's abdomen. After this observation, the neonate exhibits projectile vomiting....

The nurse is caring for a neonate at 38 weeks' gestation when the nurse observes marked peristaltic waves on the neonate's abdomen. After this observation, the neonate exhibits projectile vomiting. The nurse notifies the primary health care provider because these signs are indicative of which of the following?

1. Esophageal atresia.

2. Pyloric stenosis.

3. Diaphragmatic hernia.

4. Hiatal hernia.