Putting in a tissue valve sounds good, but these do not grow with the child and are often damaged by the immune system. Mechanical valves
don’t grow, either, and require lifelong anticoagulation
to prevent clots from forming on the valve. A Ross procedure, in which his pulmonary valve is used as the replacement aortic valve, and then a pulmonary homograft (a cadaveric pulmonary valve and artery) replace the native pulmonary valve, is not a great option, either.