Boy twin may influence girl
http://www.cnn.com/video/#/video/health/2008/07/21/cohen.twins.and.gender.cnn (http://www.cnn.com/video/#/video/health/2008/07/21/cohen.twins.and.gender.cnn)
7/21/2008
Elizabeth Cohen reports on new research that indicates a girl twin may
be influenced by a boy twin in womb.