20-hour-old newborn born via NSD to a G1P1 28- year-old mother was noted to have frothing of secretions at the mouth. When he was given milk, he regurgitated it. PE: crying, CR 155/min, RR=68/min, harsh breath sounds, good cardiac tone, soft abdomen, cyanotic lips and nail beds. What is the common anatomical presentation of this congenital condition noted early on the neonatal/infancy period?