December's International TTTS Awareness Month Fact#2 Lisa and her twins Maurice and Peter New Jersey, USA The later an embryo splits, the more likely complications like TTTS, will occur. Twin to twin transfusion syndrome (TTTS) is a disease of the placenta that affects identical twin pregnancies (or higher gestations) who share a placenta (monochorionic). The shared placenta contains abnormal blood vessels which connects the umbilical cord and circulation of the twins. The events in pregnancy th