Oudesluys-Murphy A M, Hop W, de Groot C
Department of Paediatrics, Zuiderziekenhuis, Rotterdam, The Netherlands.
Early Hum Dev. 1989 Jul;19(4):241-5. doi: 10.1016/0378-3782(89)90058-3.
In this study of twins it was found that the separation of the umbilical cord generally occurred earlier in the first born than in the second born infant. The times of cord separation of twin members are correlated and this correlation is stronger than could be expected by random pairing. However, the correlation was not stronger between monozygotic twin members than between dizygotic twin members.
