Jessica and Chad Browning were ecstatic last fall when they learned they were expecting twins. They had two children already, but wanted a third to round out their family. Twins were a bonus. About 19 weeks into the pregnancy, however, they received a shattering diagnosis: Their babies had Twin-Twin Transfusion syndrome (TTTS), a life-threatening condition in which the placenta is shared unequally by identical twins. "We were devastated," said Mrs. Browning. "It was very overwhelming. We were not going to do what's good for just one of the twins... 
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