Yeah, human heart would be hard to get so he didn't try.
Yes, suitable hearts at that age are extremely hard to get. Plus you don't know that they didn't search for a heart.
The surgeon had dedicated much of his career to finding a solution for a tragic birth defect. Hypoplastic left-heart syndrome (HLHS), a lethal underdevelopment of the left side of the heart, causes otherwise perfectly formed babies to die shortly after birth. HLHS occurs once in 12,000 live births in the United States. In such babies, the left side of the heart is usually unable to pump sufficiently to sustain life for more than a few days.
To appreciate the problem Bailey faced, one cannot ignore the historical context under which this surgery took place. It has been estimated that approximately 10,000 newborns died from hypoplastic left-heart syndrome in America alone between the first and only newborn-heart transplant (performed in 1967) and Baby Fae's surgery (in 1984). The 1967 operation was performed in New York by Dr. Adrian Kantrowitz, using the heart of an anencephalic (brain-absent) donor, a type of baby that today legally is not considered acceptable as a donor because it usually does not meet brain-death criteria. That patient died within hours of the operation. At the time of Baby Fae's surgery, heart transplantation for a newborn had not been attempted in the United States for almost 17 years.
So, to you, now the doctor's unbelief in evolution is not the failing, but that he didn't care enough for the child and wanted to attempt some stunt for fame?