Abnormal insertion of umbilical cord Marginal umbilical cord insertion 2015-12-21T12:39:39Z Marginal cord insertion Marginal cord insertion has an incidence of about 7 percent of births. It is associated with intrauterine growth retardation, preterm labor and development of velamentous cord insertion. The synonym battledore placenta is so named because of its resemblance to the bat used in the medieval game of battledore and shuttlecock. Battledore placenta SNOMEDCT_US:51519001 UMLS:C0266788 Insertion of the umbilical cord within 2 cm from the placental edge.