Why do so many vasa previa babies seem to be breeched or traverse?
Most likely the transverse lie is related to the low-lying placenta. When the placenta occupies the lower portion of the uterus, it prevents the head from engaging (going into the lower segment of the uterus, and the pelvis). Therefore, the baby may not be head first. The position of the vasa previa baby may also reflect an attempt by the baby to avoid compression of the velamentous vessels.
