In addition, a higher rate of neonatal sepsis was observed in the singleton PTDs compared with the twin PTDs.35 In another study that compared myometrial contractility in singleton vs twin pregnancies using biopsy samples obtained from women not experiencing labor but undergoing cesarean delivery, the frequency of contractions and responses to oxytocin were found to be significantly increased in the twin pregnancies. This evidence concerns the gene OXT and Neonatal sepsis.