Review Question - QID 214459

A 3-day-old boy is found to be restless with 2 episodes of green vomit. He was born at 38 weeks to a 26-year-old G2P0. The pregnancy was uncomplicated and the mother received inconsistent prenatal care. The patient is feeding every 2 hours and urinating 10-11 times per day. The mother chose to terminate her first pregnancy due to genetic testing that was positive for Down syndrome; however, she chose not to perform genetic testing during this pregnancy. On physical exam, the patient is restless but in no acute distress. His abdomen is firm and distended with hypoactive bowel sounds. Digital rectal exam reveals no stool in the rectal vault. An abdominal radiograph can be seen in Figure A. Which of the following is the most likely diagnosis?