Doctors at Boston’s Children’s Hospital have, for the first time in the United States, corrected a
deadly heart defect in a fetus. The baby, Jack, was born six weeks
early and doctors were expecting to have to widen a narrowed valve in
his heart again after his birth. But Jack did not need their help. His
aortic valve, though a bit narrow, was wide enough to do its job, and
the chambers of his heart looked healthy. Doctors were not sure the
valve would stay open after the in-utero surgery months earlier.

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