Perinatal obstetricians, surgeons, ultrasonographers, pediatricians, bioethicists, and physiologists from centers active in fetal treatment (13 centers in 5 countries) gathered at Santa Ynez Valley, California, from July 19 to 23, 1982, for a conference hosted by the Kroc Foundation entitled "Unborn: Management of the fetus with a correctable congenital defect." Experimental and clinical experience with fetal treatment was intensively reviewed in order to assess the potential benefits and liabilities of various interventions, the directions to be pursued, and the problems to be avoided. The participants agreed to pursue cooperative exchange of information, to establish a registry of treated cases, and . . .