This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Umblicial cord and diaphragm, Subject name: Anatomy
An apparently healthy newborn with a hardy appetite has begun feedings with formula. When she is laid down in the crib after feeding, she experiences projectile vomiting. Which of the following conditions is a probable cause of this vomiting? 
Select and explain. 
A. Physiological umbilical herniation, B. Esophageal hiatal hernia, C. Tetralogy of Fallot, D. Congenital diaphragmatic hernia
B: Esophageal hiatal hernia
Answer: B: Esophageal hiatal hernia 
Explanation: An esophageal hiatal hernia is a herniation of the stomach through the esophageal hiatus into the thoracic cavity. This compromises the esophagogastric sphincter so that stomach contents can easily reflux into the esophagus. The combination of a full stomach after feeding and lying down in the crib will cause vomiting in this newborn. TOF presents with cyanotic spells in baby. Congenital diaphragmatic hernia presents with breathing difficulty . Physiological umbilical herniation is not associated with vomiting.