“…Prospective studies (Seidenberg, 1949;Scott Verinis and Lyon, 1972), like retrospective studies {Nilsson et al, 1967a), are of little assistance in determin ing preventive measures. Other authors emphasize the sychosocial changes that occur after the birth {Clayton et Paffenbarger, 1961;Stevens, 1971, Davidson, 1972, Stein, 1968.…”