Nell if I could get one of the bastard doctors to talk to me I might find out, lol. That's what the registrar said to me 2 weeks ago, but I can't find any evidence anywhere to support it. The only thing I can find, is the possibility of TTTS happening just during the birth, but this need not preclude a vaginal birth. From what I've been able to piece together, if the placenta will allow blood flow between the twins, even if TTTS hasn't happened in the pg, the pressure of 2nd stage labour can cause it, or possibly more blood to the 2nd twin after the 1st cord is cut. Will keep you posted.