Umbilical Cord Say: um-bih-lih-kul kord This is the name for the long tube that runs between a mother and her unborn baby. It carries oxygen and nutrients to the baby and waste away from the baby. When the baby is born, the doctor cuts the umbilical cord and a small piece is left attached to the baby. When this piece falls off, you can see the baby's belly button! Back to Articles Related Articles Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.