The first baby was expected to live 10 years. The second baby was genetically screened so his cord blood will cure the first. "When the parents discussed having a second child, they realized they might have found a cure for Andres at the same time. If Javier could be sure to be free of the disease, and also an immunological match for Andres, he would be the ideal donor for a vital bone marrow transplant to Andres. So the parents went for it."