Search All NYTimes.com. Anne Wolf Cochran, a daughter of Mr. and Mrs. James A. Cochran of Falls Church, Va., was married yesterday to William Charles Hamilton, the son of Mrs. Joseph S. Iseman of Rye, N.Y., and the late William H. Hamilton.
1 Conjoined twins occur in approximately one in 50,000 births, and the majority do not survive (they are stillborn).
Both types of twin are carried in the same uterus at the same time, so their birth environment is the same. Research shows that the frequency of monozygotic twinning is one in 240 births. Fraternal twins are twice as common. In vitro fertilization (IVF) techniques are more likely to create dizygotic twins.