Hello Thanks for writing to HCM Briefly Symptoms in transposition of great vessels ( Blueness of the skin, Clubbing of the fingers or toes, Poor feeding, Shortness of breath ) appear at birth or very soon afterward How bad the symptoms are depends on the type and size of additional heart defects (such as atrial septal defect, ventricular septal defect, or patent ductus arteriosus) and how much the blood can mix between the two abnormal circulations. The child s symptoms will improve after surgery to correct the defect. Most infants who undergo arterial switch do not have symptoms after surgery and live normal lives. If corrective surgery is not performed, the life expectancy is only months Hope i have answered your query. Take Care