Anorectal Malformation - Imperforate Anus

A full-term male neonate born by cesarean section for breech presentation is examined at 6 hours of life. The structure marked **A** (absent anal opening in normal position) is noted on routine examination. The infant has not passed meconium in the first 24 hours, and abdominal distension develops progressively. At 20 hours of life, meconium is detected in the urine (meconiuria). An invertogram performed at 18–24 hours shows the rectal pouch above the pubococcygeal line. Renal ultrasound reveals right-sided hydronephrosis, spinal ultrasound shows a tethered cord, and echocardiography demonstrates a small ventricular septal defect. Based on the clinical presentation and imaging findings, which of the following is the most appropriate immediate management for this neonate?